mirror of
https://github.com/woodpecker-ci/woodpecker.git
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123 lines
3.7 KiB
Go
123 lines
3.7 KiB
Go
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// Copyright (C) 2017 Space Monkey, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package httpsig
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import (
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"crypto"
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"crypto/rsa"
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"encoding/base64"
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"fmt"
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"net/http"
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"strings"
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"time"
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)
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// Signer is the type used by HTTP clients to sign their request
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type Signer struct {
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id string
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key interface{}
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algo Algorithm
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headers []string
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}
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// NewSigner contructs a signer with the specified key id, key, algorithm,
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// and headers to sign. By default, if headers is nil or empty, the
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// request-target and date headers will be signed.
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func NewSigner(id string, key interface{}, algo Algorithm, headers []string) (
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signer *Signer) {
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s := &Signer{
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id: id,
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key: key,
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algo: algo,
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}
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// copy the headers slice, lowercasing as necessary
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if len(headers) == 0 {
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headers = []string{"(request-target)", "date"}
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}
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s.headers = make([]string, 0, len(headers))
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for _, header := range headers {
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s.headers = append(s.headers, strings.ToLower(header))
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}
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return s
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}
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// NewRSASHA1Signer contructs a signer with the specified key id, rsa private
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// key and headers to sign.
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func NewRSASHA1Signer(id string, key *rsa.PrivateKey, headers []string) (signer *Signer) {
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return NewSigner(id, key, RSASHA1, headers)
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}
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// NewRSASHA256Signer contructs a signer with the specified key id, rsa private
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// key and headers to sign.
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func NewRSASHA256Signer(id string, key *rsa.PrivateKey, headers []string) (signer *Signer) {
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return NewSigner(id, key, RSASHA256, headers)
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}
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// NewHMACSHA256Signer contructs a signer with the specified key id, hmac key,
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// and headers to sign.
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func NewHMACSHA256Signer(id string, key []byte, headers []string) (
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signer *Signer) {
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return NewSigner(id, key, HMACSHA256, headers)
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}
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// NewEd25519Signer contructs a signer with the specified key id, Ed25519 key,
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// and headers to sign.
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func NewEd25519Signer(id string, key crypto.PrivateKey, headers []string) *Signer {
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return NewSigner(id, key, Ed25519, headers)
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}
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// Sign signs an http request and adds the signature to the authorization header
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func (r *Signer) Sign(req *http.Request) error {
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now := time.Now()
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params, err := signRequest(r.id, r.key, r.algo, r.headers, now, now.Add(time.Minute), req)
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if err != nil {
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return err
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}
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req.Header.Set("Authorization", "Signature "+params)
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return nil
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}
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// signRequest signs an http request and returns the parameter string.
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func signRequest(id string, key interface{}, algo Algorithm, headers []string, created, expires time.Time, req *http.Request) (params string, err error) {
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signatureData, err := BuildSignatureData(req, headers, created, expires)
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if err != nil {
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return "", err
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}
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signature, err := algo.Sign(key, signatureData)
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if err != nil {
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return "", err
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}
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// The headers parameter can be omitted if the only header is "Date". The
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// receiving end assumes ["date"] if no headers parameter is present.
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var headersParam string
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if !(len(headers) == 1 && headers[0] == "date") {
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headersParam = fmt.Sprintf("headers=%q,", strings.Join(headers, " "))
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}
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return fmt.Sprintf(
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"keyId=%q,algorithm=%q,created=\"%d\",expires=\"%d\",%ssignature=%q",
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id,
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algo.Name(),
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created.Unix(),
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expires.Unix(),
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headersParam,
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base64.StdEncoding.EncodeToString(signature)), nil
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}
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