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This allows endpoints to respond with zstd compressed metric data, if the requester supports it. I have imported a content-encoding parser from https://github.com/golang/gddo which is an archived repository to support different content-encoding headers. Signed-off-by: Manuel Rüger <manuel@rueg.eu>
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,27 @@ | ||
| Copyright (c) 2013 The Go Authors. All rights reserved. | ||
|
|
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| Redistribution and use in source and binary forms, with or without | ||
| modification, are permitted provided that the following conditions are | ||
| met: | ||
|
|
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| * Redistributions of source code must retain the above copyright | ||
| notice, this list of conditions and the following disclaimer. | ||
| * Redistributions in binary form must reproduce the above | ||
| copyright notice, this list of conditions and the following disclaimer | ||
| in the documentation and/or other materials provided with the | ||
| distribution. | ||
| * Neither the name of Google Inc. nor the names of its | ||
| contributors may be used to endorse or promote products derived from | ||
| this software without specific prior written permission. | ||
|
|
||
| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | ||
| "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | ||
| LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | ||
| A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | ||
| OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | ||
| SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | ||
| LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | ||
| DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | ||
| THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | ||
| (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | ||
| OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1 @@ | ||
| This source code is a stripped down version from the archived repository https://github.com/golang/gddo and licensed under BSD. |
145 changes: 145 additions & 0 deletions
145
internal/github.com/golang/gddo/httputil/header/header.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,145 @@ | ||
| // Copyright 2013 The Go Authors. All rights reserved. | ||
| // | ||
| // Use of this source code is governed by a BSD-style | ||
| // license that can be found in the LICENSE file or at | ||
| // https://developers.google.com/open-source/licenses/bsd. | ||
|
|
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| // Package header provides functions for parsing HTTP headers. | ||
| package header | ||
|
|
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| import ( | ||
| "net/http" | ||
| "strings" | ||
| ) | ||
|
|
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| // Octet types from RFC 2616. | ||
| var octetTypes [256]octetType | ||
|
|
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| type octetType byte | ||
|
|
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| const ( | ||
| isToken octetType = 1 << iota | ||
| isSpace | ||
| ) | ||
|
|
||
| func init() { | ||
| // OCTET = <any 8-bit sequence of data> | ||
| // CHAR = <any US-ASCII character (octets 0 - 127)> | ||
| // CTL = <any US-ASCII control character (octets 0 - 31) and DEL (127)> | ||
| // CR = <US-ASCII CR, carriage return (13)> | ||
| // LF = <US-ASCII LF, linefeed (10)> | ||
| // SP = <US-ASCII SP, space (32)> | ||
| // HT = <US-ASCII HT, horizontal-tab (9)> | ||
| // <"> = <US-ASCII double-quote mark (34)> | ||
| // CRLF = CR LF | ||
| // LWS = [CRLF] 1*( SP | HT ) | ||
| // TEXT = <any OCTET except CTLs, but including LWS> | ||
| // separators = "(" | ")" | "<" | ">" | "@" | "," | ";" | ":" | "\" | <"> | ||
| // | "/" | "[" | "]" | "?" | "=" | "{" | "}" | SP | HT | ||
| // token = 1*<any CHAR except CTLs or separators> | ||
| // qdtext = <any TEXT except <">> | ||
|
|
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| for c := 0; c < 256; c++ { | ||
| var t octetType | ||
| isCtl := c <= 31 || c == 127 | ||
| isChar := 0 <= c && c <= 127 | ||
| isSeparator := strings.ContainsRune(" \t\"(),/:;<=>?@[]\\{}", rune(c)) | ||
| if strings.ContainsRune(" \t\r\n", rune(c)) { | ||
| t |= isSpace | ||
| } | ||
| if isChar && !isCtl && !isSeparator { | ||
| t |= isToken | ||
| } | ||
| octetTypes[c] = t | ||
| } | ||
| } | ||
|
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| // AcceptSpec describes an Accept* header. | ||
| type AcceptSpec struct { | ||
| Value string | ||
| Q float64 | ||
| } | ||
|
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| // ParseAccept parses Accept* headers. | ||
| func ParseAccept(header http.Header, key string) (specs []AcceptSpec) { | ||
| loop: | ||
| for _, s := range header[key] { | ||
| for { | ||
| var spec AcceptSpec | ||
| spec.Value, s = expectTokenSlash(s) | ||
| if spec.Value == "" { | ||
| continue loop | ||
| } | ||
| spec.Q = 1.0 | ||
| s = skipSpace(s) | ||
| if strings.HasPrefix(s, ";") { | ||
| s = skipSpace(s[1:]) | ||
| if !strings.HasPrefix(s, "q=") { | ||
| continue loop | ||
| } | ||
| spec.Q, s = expectQuality(s[2:]) | ||
| if spec.Q < 0.0 { | ||
| continue loop | ||
| } | ||
| } | ||
| specs = append(specs, spec) | ||
| s = skipSpace(s) | ||
| if !strings.HasPrefix(s, ",") { | ||
| continue loop | ||
| } | ||
| s = skipSpace(s[1:]) | ||
| } | ||
| } | ||
| return | ||
| } | ||
|
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| func skipSpace(s string) (rest string) { | ||
| i := 0 | ||
| for ; i < len(s); i++ { | ||
| if octetTypes[s[i]]&isSpace == 0 { | ||
| break | ||
| } | ||
| } | ||
| return s[i:] | ||
| } | ||
|
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| func expectTokenSlash(s string) (token, rest string) { | ||
| i := 0 | ||
| for ; i < len(s); i++ { | ||
| b := s[i] | ||
| if (octetTypes[b]&isToken == 0) && b != '/' { | ||
| break | ||
| } | ||
| } | ||
| return s[:i], s[i:] | ||
| } | ||
|
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| func expectQuality(s string) (q float64, rest string) { | ||
| switch { | ||
| case len(s) == 0: | ||
| return -1, "" | ||
| case s[0] == '0': | ||
| q = 0 | ||
| case s[0] == '1': | ||
| q = 1 | ||
| default: | ||
| return -1, "" | ||
| } | ||
| s = s[1:] | ||
| if !strings.HasPrefix(s, ".") { | ||
| return q, s | ||
| } | ||
| s = s[1:] | ||
| i := 0 | ||
| n := 0 | ||
| d := 1 | ||
| for ; i < len(s); i++ { | ||
| b := s[i] | ||
| if b < '0' || b > '9' { | ||
| break | ||
| } | ||
| n = n*10 + int(b) - '0' | ||
| d *= 10 | ||
| } | ||
| return q + float64(n)/float64(d), s[i:] | ||
| } |
49 changes: 49 additions & 0 deletions
49
internal/github.com/golang/gddo/httputil/header/header_test.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,49 @@ | ||
| // Copyright 2013 The Go Authors. All rights reserved. | ||
| // | ||
| // Use of this source code is governed by a BSD-style | ||
| // license that can be found in the LICENSE file or at | ||
| // https://developers.google.com/open-source/licenses/bsd. | ||
|
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| package header | ||
|
|
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| import ( | ||
| "net/http" | ||
| "testing" | ||
|
|
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| "github.com/google/go-cmp/cmp" | ||
| ) | ||
|
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| var parseAcceptTests = []struct { | ||
| s string | ||
| expected []AcceptSpec | ||
| }{ | ||
| {"text/html", []AcceptSpec{{"text/html", 1}}}, | ||
| {"text/html; q=0", []AcceptSpec{{"text/html", 0}}}, | ||
| {"text/html; q=0.0", []AcceptSpec{{"text/html", 0}}}, | ||
| {"text/html; q=1", []AcceptSpec{{"text/html", 1}}}, | ||
| {"text/html; q=1.0", []AcceptSpec{{"text/html", 1}}}, | ||
| {"text/html; q=0.1", []AcceptSpec{{"text/html", 0.1}}}, | ||
| {"text/html;q=0.1", []AcceptSpec{{"text/html", 0.1}}}, | ||
| {"text/html, text/plain", []AcceptSpec{{"text/html", 1}, {"text/plain", 1}}}, | ||
| {"text/html; q=0.1, text/plain", []AcceptSpec{{"text/html", 0.1}, {"text/plain", 1}}}, | ||
| {"iso-8859-5, unicode-1-1;q=0.8,iso-8859-1", []AcceptSpec{{"iso-8859-5", 1}, {"unicode-1-1", 0.8}, {"iso-8859-1", 1}}}, | ||
| {"iso-8859-1", []AcceptSpec{{"iso-8859-1", 1}}}, | ||
| {"*", []AcceptSpec{{"*", 1}}}, | ||
| {"da, en-gb;q=0.8, en;q=0.7", []AcceptSpec{{"da", 1}, {"en-gb", 0.8}, {"en", 0.7}}}, | ||
| {"da, q, en-gb;q=0.8", []AcceptSpec{{"da", 1}, {"q", 1}, {"en-gb", 0.8}}}, | ||
| {"image/png, image/*;q=0.5", []AcceptSpec{{"image/png", 1}, {"image/*", 0.5}}}, | ||
|
|
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| // bad cases | ||
| {"value1; q=0.1.2", []AcceptSpec{{"value1", 0.1}}}, | ||
| {"da, en-gb;q=foo", []AcceptSpec{{"da", 1}}}, | ||
| } | ||
|
|
||
| func TestParseAccept(t *testing.T) { | ||
| for _, tt := range parseAcceptTests { | ||
| header := http.Header{"Accept": {tt.s}} | ||
| actual := ParseAccept(header, "Accept") | ||
| if !cmp.Equal(actual, tt.expected) { | ||
| t.Errorf("ParseAccept(h, %q)=%v, want %v", tt.s, actual, tt.expected) | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,36 @@ | ||
| // Copyright 2013 The Go Authors. All rights reserved. | ||
| // | ||
| // Use of this source code is governed by a BSD-style | ||
| // license that can be found in the LICENSE file or at | ||
| // https://developers.google.com/open-source/licenses/bsd. | ||
|
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| package httputil | ||
|
|
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| import ( | ||
| "net/http" | ||
|
|
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| "github.com/prometheus/client_golang/internal/github.com/golang/gddo/httputil/header" | ||
| ) | ||
|
|
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| // NegotiateContentEncoding returns the best offered content encoding for the | ||
| // request's Accept-Encoding header. If two offers match with equal weight and | ||
| // then the offer earlier in the list is preferred. If no offers are | ||
| // acceptable, then "" is returned. | ||
| func NegotiateContentEncoding(r *http.Request, offers []string) string { | ||
| bestOffer := "identity" | ||
| bestQ := -1.0 | ||
| specs := header.ParseAccept(r.Header, "Accept-Encoding") | ||
| for _, offer := range offers { | ||
| for _, spec := range specs { | ||
| if spec.Q > bestQ && | ||
| (spec.Value == "*" || spec.Value == offer) { | ||
| bestQ = spec.Q | ||
| bestOffer = offer | ||
| } | ||
| } | ||
| } | ||
| if bestQ == 0 { | ||
| bestOffer = "" | ||
| } | ||
| return bestOffer | ||
| } |
40 changes: 40 additions & 0 deletions
40
internal/github.com/golang/gddo/httputil/negotiate_test.go
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|---|---|---|
| @@ -0,0 +1,40 @@ | ||
| // Copyright 2013 The Go Authors. All rights reserved. | ||
| // | ||
| // Use of this source code is governed by a BSD-style | ||
| // license that can be found in the LICENSE file or at | ||
| // https://developers.google.com/open-source/licenses/bsd. | ||
|
|
||
| package httputil | ||
|
|
||
| import ( | ||
| "net/http" | ||
| "testing" | ||
| ) | ||
|
|
||
| var negotiateContentEncodingTests = []struct { | ||
| s string | ||
| offers []string | ||
| expect string | ||
| }{ | ||
| {"", []string{"identity", "gzip"}, "identity"}, | ||
| {"*;q=0", []string{"identity", "gzip"}, ""}, | ||
| {"gzip", []string{"identity", "gzip"}, "gzip"}, | ||
| {"gzip,zstd", []string{"identity", "zstd"}, "zstd"}, | ||
| {"zstd,gzip", []string{"gzip", "zstd"}, "gzip"}, | ||
| {"gzip,zstd", []string{"gzip", "zstd"}, "gzip"}, | ||
| {"gzip,zstd", []string{"zstd", "gzip"}, "zstd"}, | ||
| {"gzip;q=0.1,zstd;q=0.5", []string{"gzip", "zstd"}, "zstd"}, | ||
| {"gzip;q=1.0, identity; q=0.5, *;q=0", []string{"identity", "gzip"}, "gzip"}, | ||
| {"gzip;q=1.0, identity; q=0.5, *;q=0", []string{"identity", "zstd"}, "identity"}, | ||
| {"zstd", []string{"identity", "gzip"}, "identity"}, | ||
| } | ||
|
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| func TestNegotiateContentEncoding(t *testing.T) { | ||
| for _, tt := range negotiateContentEncodingTests { | ||
| r := &http.Request{Header: http.Header{"Accept-Encoding": {tt.s}}} | ||
| actual := NegotiateContentEncoding(r, tt.offers) | ||
| if actual != tt.expect { | ||
| t.Errorf("NegotiateContentEncoding(%q, %#v)=%q, want %q", tt.s, tt.offers, actual, tt.expect) | ||
| } | ||
| } | ||
| } |
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