Ports zig-uri to stdlib.
This commit is contained in:
Felix "xq" Queißner
committed by
Andrew Kelley
Andrew Kelley
parent
3806091a10
commit
08496aa2aa
581
lib/std/Url.zig
581
lib/std/Url.zig
@@ -1,98 +1,515 @@
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scheme: []const u8,
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host: []const u8,
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path: []const u8,
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port: ?u16,
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/// TODO: redo this implementation according to RFC 1738. This code is only a
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/// placeholder for now.
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pub fn parse(s: []const u8) !Url {
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var scheme_end: usize = 0;
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var host_start: usize = 0;
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var host_end: usize = 0;
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var path_start: usize = 0;
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var port_start: usize = 0;
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var port_end: usize = 0;
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var state: enum {
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scheme,
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scheme_slash1,
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scheme_slash2,
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host,
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port,
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path,
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} = .scheme;
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for (s) |b, i| switch (state) {
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.scheme => switch (b) {
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':' => {
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state = .scheme_slash1;
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scheme_end = i;
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},
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else => {},
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},
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.scheme_slash1 => switch (b) {
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'/' => {
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state = .scheme_slash2;
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},
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else => return error.InvalidUrl,
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},
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.scheme_slash2 => switch (b) {
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'/' => {
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state = .host;
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host_start = i + 1;
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},
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else => return error.InvalidUrl,
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},
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.host => switch (b) {
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':' => {
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state = .port;
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host_end = i;
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port_start = i + 1;
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},
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'/' => {
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state = .path;
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host_end = i;
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path_start = i;
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},
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else => {},
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},
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.port => switch (b) {
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'/' => {
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port_end = i;
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state = .path;
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path_start = i;
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},
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else => {},
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},
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.path => {},
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};
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const port_slice = s[port_start..port_end];
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const port = if (port_slice.len == 0) null else try std.fmt.parseInt(u16, port_slice, 10);
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return .{
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.scheme = s[0..scheme_end],
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.host = s[host_start..host_end],
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.path = s[path_start..],
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.port = port,
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};
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}
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//! Implements URI parsing roughly adhering to <https://tools.ietf.org/html/rfc3986>.
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//! Does not do perfect grammar and character class checking, but should be robust against URIs in the wild.
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const Url = @This();
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const std = @import("std.zig");
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const testing = std.testing;
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scheme: ?[]const u8,
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user: ?[]const u8,
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password: ?[]const u8,
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host: ?[]const u8,
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port: ?u16,
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path: []const u8,
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query: ?[]const u8,
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fragment: ?[]const u8,
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/// Applies URI encoding and replaces all reserved characters with their respective %XX code.
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pub fn escapeString(allocator: std.mem.Allocator, input: []const u8) error{OutOfMemory}![]const u8 {
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var outsize: usize = 0;
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for (input) |c| {
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outsize += if (isUnreserved(c)) @as(usize, 1) else 3;
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}
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var output = try allocator.alloc(u8, outsize);
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var outptr: usize = 0;
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for (input) |c| {
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if (isUnreserved(c)) {
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output[outptr] = c;
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outptr += 1;
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} else {
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var buf: [2]u8 = undefined;
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_ = std.fmt.bufPrint(&buf, "{X:0>2}", .{c}) catch unreachable;
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output[outptr + 0] = '%';
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output[outptr + 1] = buf[0];
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output[outptr + 2] = buf[1];
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outptr += 3;
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}
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}
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return output;
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}
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/// Parses a URI string and unescapes all %XX where XX is a valid hex number. Otherwise, verbatim copies
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/// them to the output.
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pub fn unescapeString(allocator: std.mem.Allocator, input: []const u8) error{OutOfMemory}![]const u8 {
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var outsize: usize = 0;
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var inptr: usize = 0;
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while (inptr < input.len) {
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if (input[inptr] == '%') {
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inptr += 1;
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if (inptr + 2 <= input.len) {
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_ = std.fmt.parseInt(u8, input[inptr..][0..2], 16) catch {
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outsize += 3;
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inptr += 2;
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continue;
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};
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inptr += 2;
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outsize += 1;
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}
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} else {
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inptr += 1;
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outsize += 1;
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}
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}
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var output = try allocator.alloc(u8, outsize);
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var outptr: usize = 0;
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inptr = 0;
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while (inptr < input.len) {
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if (input[inptr] == '%') {
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inptr += 1;
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if (inptr + 2 <= input.len) {
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const value = std.fmt.parseInt(u8, input[inptr..][0..2], 16) catch {
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output[outptr + 0] = input[inptr + 0];
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output[outptr + 1] = input[inptr + 1];
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inptr += 2;
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outptr += 2;
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continue;
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};
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output[outptr] = value;
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inptr += 2;
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outptr += 1;
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}
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} else {
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output[outptr] = input[inptr];
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inptr += 1;
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outptr += 1;
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}
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}
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return output;
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}
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pub const ParseError = error{ UnexpectedCharacter, InvalidFormat, InvalidPort };
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/// Parses the URI or returns an error.
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/// The return value will contain unescaped strings pointing into the
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/// original `text`. Each component that is provided, will be non-`null`.
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pub fn parse(text: []const u8) ParseError!Url {
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var uri = Url{
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.scheme = null,
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.user = null,
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.password = null,
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.host = null,
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.port = null,
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.path = "", // path is always set, but empty by default.
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.query = null,
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.fragment = null,
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};
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var reader = SliceReader{ .slice = text };
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uri.scheme = reader.readWhile(isSchemeChar);
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// after the scheme, a ':' must appear
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if (reader.get()) |c| {
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if (c != ':')
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return error.UnexpectedCharacter;
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} else {
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return error.InvalidFormat;
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}
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if (reader.peekPrefix("//")) { // authority part
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std.debug.assert(reader.get().? == '/');
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std.debug.assert(reader.get().? == '/');
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const authority = reader.readUntil(isAuthoritySeparator);
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if (authority.len == 0)
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return error.InvalidFormat;
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var start_of_host: usize = 0;
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if (std.mem.indexOf(u8, authority, "@")) |index| {
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start_of_host = index + 1;
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const user_info = authority[0..index];
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if (std.mem.indexOf(u8, user_info, ":")) |idx| {
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uri.user = user_info[0..idx];
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if (idx < user_info.len - 1) { // empty password is also "no password"
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uri.password = user_info[idx + 1 ..];
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}
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} else {
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uri.user = user_info;
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uri.password = null;
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}
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}
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var end_of_host: usize = authority.len;
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if (authority[start_of_host] == '[') { // IPv6
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end_of_host = std.mem.lastIndexOf(u8, authority, "]") orelse return error.InvalidFormat;
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end_of_host += 1;
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if (std.mem.lastIndexOf(u8, authority, ":")) |index| {
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if (index >= end_of_host) { // if not part of the V6 address field
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end_of_host = std.math.min(end_of_host, index);
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uri.port = std.fmt.parseInt(u16, authority[index + 1 ..], 10) catch return error.InvalidPort;
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}
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}
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} else if (std.mem.lastIndexOf(u8, authority, ":")) |index| {
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if (index >= start_of_host) { // if not part of the userinfo field
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end_of_host = std.math.min(end_of_host, index);
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uri.port = std.fmt.parseInt(u16, authority[index + 1 ..], 10) catch return error.InvalidPort;
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}
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}
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uri.host = authority[start_of_host..end_of_host];
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}
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uri.path = reader.readUntil(isPathSeparator);
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if ((reader.peek() orelse 0) == '?') { // query part
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std.debug.assert(reader.get().? == '?');
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uri.query = reader.readUntil(isQuerySeparator);
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}
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if ((reader.peek() orelse 0) == '#') { // fragment part
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std.debug.assert(reader.get().? == '#');
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uri.fragment = reader.readUntilEof();
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}
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return uri;
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}
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const SliceReader = struct {
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const Self = @This();
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slice: []const u8,
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offset: usize = 0,
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fn get(self: *Self) ?u8 {
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if (self.offset >= self.slice.len)
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return null;
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const c = self.slice[self.offset];
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self.offset += 1;
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return c;
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}
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fn peek(self: Self) ?u8 {
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if (self.offset >= self.slice.len)
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return null;
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return self.slice[self.offset];
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}
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fn readWhile(self: *Self, comptime predicate: fn (u8) bool) []const u8 {
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const start = self.offset;
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var end = start;
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while (end < self.slice.len and predicate(self.slice[end])) {
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end += 1;
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}
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self.offset = end;
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return self.slice[start..end];
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}
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fn readUntil(self: *Self, comptime predicate: fn (u8) bool) []const u8 {
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const start = self.offset;
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var end = start;
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while (end < self.slice.len and !predicate(self.slice[end])) {
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end += 1;
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}
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self.offset = end;
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return self.slice[start..end];
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}
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fn readUntilEof(self: *Self) []const u8 {
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const start = self.offset;
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self.offset = self.slice.len;
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return self.slice[start..];
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}
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fn peekPrefix(self: Self, prefix: []const u8) bool {
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if (self.offset + prefix.len > self.slice.len)
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return false;
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return std.mem.eql(u8, self.slice[self.offset..][0..prefix.len], prefix);
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}
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};
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/// scheme = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )
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fn isSchemeChar(c: u8) bool {
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return switch (c) {
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'A'...'Z', 'a'...'z', '0'...'9', '+', '-', '.' => true,
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else => false,
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};
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}
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fn isAuthoritySeparator(c: u8) bool {
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return switch (c) {
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'/', '?', '#' => true,
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else => false,
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};
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}
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/// reserved = gen-delims / sub-delims
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fn isReserved(c: u8) bool {
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return isGenLimit(c) or isSubLimit(c);
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}
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/// gen-delims = ":" / "/" / "?" / "#" / "[" / "]" / "@"
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fn isGenLimit(c: u8) bool {
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return switch (c) {
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':', ',', '?', '#', '[', ']', '@' => true,
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else => false,
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};
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}
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/// sub-delims = "!" / "$" / "&" / "'" / "(" / ")"
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/// / "*" / "+" / "," / ";" / "="
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fn isSubLimit(c: u8) bool {
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return switch (c) {
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'!', '$', '&', '\'', '(', ')', '*', '+', ',', ';', '=' => true,
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else => false,
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};
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}
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/// unreserved = ALPHA / DIGIT / "-" / "." / "_" / "~"
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fn isUnreserved(c: u8) bool {
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return switch (c) {
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'A'...'Z', 'a'...'z', '0'...'9', '-', '.', '_', '~' => true,
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else => false,
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};
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}
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fn isPathSeparator(c: u8) bool {
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return switch (c) {
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'?', '#' => true,
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else => false,
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};
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}
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fn isQuerySeparator(c: u8) bool {
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return switch (c) {
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'#' => true,
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else => false,
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};
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}
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test "basic" {
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const parsed = try parse("https://ziglang.org/download");
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try testing.expectEqualStrings("https", parsed.scheme);
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try testing.expectEqualStrings("ziglang.org", parsed.host);
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try testing.expectEqualStrings("https", parsed.scheme orelse return error.UnexpectedNull);
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try testing.expectEqualStrings("ziglang.org", parsed.host orelse return error.UnexpectedNull);
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try testing.expectEqualStrings("/download", parsed.path);
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try testing.expectEqual(@as(?u16, null), parsed.port);
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}
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test "with port" {
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const parsed = try parse("http://example:1337/");
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try testing.expectEqualStrings("http", parsed.scheme);
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try testing.expectEqualStrings("example", parsed.host);
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try testing.expectEqualStrings("http", parsed.scheme orelse return error.UnexpectedNull);
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try testing.expectEqualStrings("example", parsed.host orelse return error.UnexpectedNull);
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try testing.expectEqualStrings("/", parsed.path);
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try testing.expectEqual(@as(?u16, 1337), parsed.port);
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}
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test "should fail gracefully" {
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try std.testing.expectEqual(@as(ParseError!Url, error.InvalidFormat), parse("foobar://"));
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}
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test "scheme" {
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try std.testing.expectEqualSlices(u8, "http", (try parse("http:_")).scheme.?);
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try std.testing.expectEqualSlices(u8, "scheme-mee", (try parse("scheme-mee:_")).scheme.?);
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try std.testing.expectEqualSlices(u8, "a.b.c", (try parse("a.b.c:_")).scheme.?);
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try std.testing.expectEqualSlices(u8, "ab+", (try parse("ab+:_")).scheme.?);
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try std.testing.expectEqualSlices(u8, "X+++", (try parse("X+++:_")).scheme.?);
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try std.testing.expectEqualSlices(u8, "Y+-.", (try parse("Y+-.:_")).scheme.?);
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}
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test "authority" {
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try std.testing.expectEqualSlices(u8, "hostname", (try parse("scheme://hostname")).host.?);
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try std.testing.expectEqualSlices(u8, "hostname", (try parse("scheme://userinfo@hostname")).host.?);
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try std.testing.expectEqualSlices(u8, "userinfo", (try parse("scheme://userinfo@hostname")).user.?);
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try std.testing.expectEqual(@as(?[]const u8, null), (try parse("scheme://userinfo@hostname")).password);
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try std.testing.expectEqualSlices(u8, "hostname", (try parse("scheme://user:password@hostname")).host.?);
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try std.testing.expectEqualSlices(u8, "user", (try parse("scheme://user:password@hostname")).user.?);
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try std.testing.expectEqualSlices(u8, "password", (try parse("scheme://user:password@hostname")).password.?);
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try std.testing.expectEqualSlices(u8, "hostname", (try parse("scheme://hostname:0")).host.?);
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try std.testing.expectEqual(@as(u16, 1234), (try parse("scheme://hostname:1234")).port.?);
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try std.testing.expectEqualSlices(u8, "hostname", (try parse("scheme://userinfo@hostname:1234")).host.?);
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try std.testing.expectEqual(@as(u16, 1234), (try parse("scheme://userinfo@hostname:1234")).port.?);
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try std.testing.expectEqualSlices(u8, "userinfo", (try parse("scheme://userinfo@hostname:1234")).user.?);
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try std.testing.expectEqual(@as(?[]const u8, null), (try parse("scheme://userinfo@hostname:1234")).password);
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try std.testing.expectEqualSlices(u8, "hostname", (try parse("scheme://user:password@hostname:1234")).host.?);
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try std.testing.expectEqual(@as(u16, 1234), (try parse("scheme://user:password@hostname:1234")).port.?);
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try std.testing.expectEqualSlices(u8, "user", (try parse("scheme://user:password@hostname:1234")).user.?);
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try std.testing.expectEqualSlices(u8, "password", (try parse("scheme://user:password@hostname:1234")).password.?);
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}
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test "authority.password" {
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try std.testing.expectEqualSlices(u8, "username", (try parse("scheme://username@a")).user.?);
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try std.testing.expectEqual(@as(?[]const u8, null), (try parse("scheme://username@a")).password);
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try std.testing.expectEqualSlices(u8, "username", (try parse("scheme://username:@a")).user.?);
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try std.testing.expectEqual(@as(?[]const u8, null), (try parse("scheme://username:@a")).password);
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try std.testing.expectEqualSlices(u8, "username", (try parse("scheme://username:password@a")).user.?);
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try std.testing.expectEqualSlices(u8, "password", (try parse("scheme://username:password@a")).password.?);
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try std.testing.expectEqualSlices(u8, "username", (try parse("scheme://username::@a")).user.?);
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try std.testing.expectEqualSlices(u8, ":", (try parse("scheme://username::@a")).password.?);
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}
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fn testAuthorityHost(comptime hostlist: anytype) !void {
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inline for (hostlist) |hostname| {
|
||||
try std.testing.expectEqualSlices(u8, hostname, (try parse("scheme://" ++ hostname)).host.?);
|
||||
}
|
||||
}
|
||||
|
||||
test "authority.dns-names" {
|
||||
try testAuthorityHost(.{
|
||||
"a",
|
||||
"a.b",
|
||||
"example.com",
|
||||
"www.example.com",
|
||||
"example.org.",
|
||||
"www.example.org.",
|
||||
"xn--nw2a.xn--j6w193g", // internationalized URI: 見.香港
|
||||
"fe80--1ff-fe23-4567-890as3.ipv6-literal.net",
|
||||
});
|
||||
}
|
||||
|
||||
test "authority.IPv4" {
|
||||
try testAuthorityHost(.{
|
||||
"127.0.0.1",
|
||||
"255.255.255.255",
|
||||
"0.0.0.0",
|
||||
"8.8.8.8",
|
||||
"1.2.3.4",
|
||||
"192.168.0.1",
|
||||
"10.42.0.0",
|
||||
});
|
||||
}
|
||||
|
||||
test "authority.IPv6" {
|
||||
try testAuthorityHost(.{
|
||||
"[2001:db8:0:0:0:0:2:1]",
|
||||
"[2001:db8::2:1]",
|
||||
"[2001:db8:0000:1:1:1:1:1]",
|
||||
"[2001:db8:0:1:1:1:1:1]",
|
||||
"[0:0:0:0:0:0:0:0]",
|
||||
"[0:0:0:0:0:0:0:1]",
|
||||
"[::1]",
|
||||
"[::]",
|
||||
"[2001:db8:85a3:8d3:1319:8a2e:370:7348]",
|
||||
"[fe80::1ff:fe23:4567:890a%25eth2]",
|
||||
"[fe80::1ff:fe23:4567:890a]",
|
||||
"[fe80::1ff:fe23:4567:890a%253]",
|
||||
"[fe80:3::1ff:fe23:4567:890a]",
|
||||
});
|
||||
}
|
||||
|
||||
test "RFC example 1" {
|
||||
const uri = "foo://example.com:8042/over/there?name=ferret#nose";
|
||||
try std.testing.expectEqual(Url{
|
||||
.scheme = uri[0..3],
|
||||
.user = null,
|
||||
.password = null,
|
||||
.host = uri[6..17],
|
||||
.port = 8042,
|
||||
.path = uri[22..33],
|
||||
.query = uri[34..45],
|
||||
.fragment = uri[46..50],
|
||||
}, try parse(uri));
|
||||
}
|
||||
|
||||
test "RFX example 2" {
|
||||
const uri = "urn:example:animal:ferret:nose";
|
||||
try std.testing.expectEqual(Url{
|
||||
.scheme = uri[0..3],
|
||||
.user = null,
|
||||
.password = null,
|
||||
.host = null,
|
||||
.port = null,
|
||||
.path = uri[4..],
|
||||
.query = null,
|
||||
.fragment = null,
|
||||
}, try parse(uri));
|
||||
}
|
||||
|
||||
// source:
|
||||
// https://en.wikipedia.org/wiki/Uniform_Resource_Identifier#Examples
|
||||
test "Examples from wikipedia" {
|
||||
const list = [_][]const u8{
|
||||
"https://john.doe@www.example.com:123/forum/questions/?tag=networking&order=newest#top",
|
||||
"ldap://[2001:db8::7]/c=GB?objectClass?one",
|
||||
"mailto:John.Doe@example.com",
|
||||
"news:comp.infosystems.www.servers.unix",
|
||||
"tel:+1-816-555-1212",
|
||||
"telnet://192.0.2.16:80/",
|
||||
"urn:oasis:names:specification:docbook:dtd:xml:4.1.2",
|
||||
"http://a/b/c/d;p?q",
|
||||
};
|
||||
for (list) |uri| {
|
||||
_ = try parse(uri);
|
||||
}
|
||||
}
|
||||
|
||||
// source:
|
||||
// https://tools.ietf.org/html/rfc3986#section-5.4.1
|
||||
test "Examples from RFC3986" {
|
||||
const list = [_][]const u8{
|
||||
"http://a/b/c/g",
|
||||
"http://a/b/c/g",
|
||||
"http://a/b/c/g/",
|
||||
"http://a/g",
|
||||
"http://g",
|
||||
"http://a/b/c/d;p?y",
|
||||
"http://a/b/c/g?y",
|
||||
"http://a/b/c/d;p?q#s",
|
||||
"http://a/b/c/g#s",
|
||||
"http://a/b/c/g?y#s",
|
||||
"http://a/b/c/;x",
|
||||
"http://a/b/c/g;x",
|
||||
"http://a/b/c/g;x?y#s",
|
||||
"http://a/b/c/d;p?q",
|
||||
"http://a/b/c/",
|
||||
"http://a/b/c/",
|
||||
"http://a/b/",
|
||||
"http://a/b/",
|
||||
"http://a/b/g",
|
||||
"http://a/",
|
||||
"http://a/",
|
||||
"http://a/g",
|
||||
};
|
||||
for (list) |uri| {
|
||||
_ = try parse(uri);
|
||||
}
|
||||
}
|
||||
|
||||
test "Special test" {
|
||||
// This is for all of you code readers ♥
|
||||
_ = try parse("https://www.youtube.com/watch?v=dQw4w9WgXcQ&feature=youtu.be&t=0");
|
||||
}
|
||||
|
||||
test "URI escaping" {
|
||||
const input = "\\ö/ äöß ~~.adas-https://canvas:123/#ads&&sad";
|
||||
const expected = "%5C%C3%B6%2F%20%C3%A4%C3%B6%C3%9F%20~~.adas-https%3A%2F%2Fcanvas%3A123%2F%23ads%26%26sad";
|
||||
|
||||
const actual = try escapeString(std.testing.allocator, input);
|
||||
defer std.testing.allocator.free(actual);
|
||||
|
||||
try std.testing.expectEqualSlices(u8, expected, actual);
|
||||
}
|
||||
|
||||
test "URI unescaping" {
|
||||
const input = "%5C%C3%B6%2F%20%C3%A4%C3%B6%C3%9F%20~~.adas-https%3A%2F%2Fcanvas%3A123%2F%23ads%26%26sad";
|
||||
const expected = "\\ö/ äöß ~~.adas-https://canvas:123/#ads&&sad";
|
||||
|
||||
const actual = try unescapeString(std.testing.allocator, input);
|
||||
defer std.testing.allocator.free(actual);
|
||||
|
||||
try std.testing.expectEqualSlices(u8, expected, actual);
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user