116 lines
3 KiB
Go
116 lines
3 KiB
Go
// v2 signing
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package s3
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import (
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"crypto/hmac"
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"crypto/sha1"
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"encoding/base64"
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"net/http"
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"sort"
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"strings"
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"time"
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)
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// URL parameters that need to be added to the signature
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var s3ParamsToSign = map[string]struct{}{
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"acl": {},
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"location": {},
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"logging": {},
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"notification": {},
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"partNumber": {},
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"policy": {},
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"requestPayment": {},
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"torrent": {},
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"uploadId": {},
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"uploads": {},
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"versionId": {},
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"versioning": {},
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"versions": {},
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"response-content-type": {},
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"response-content-language": {},
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"response-expires": {},
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"response-cache-control": {},
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"response-content-disposition": {},
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"response-content-encoding": {},
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}
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// sign signs requests using v2 auth
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//
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// Cobbled together from goamz and aws-sdk-go
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func sign(AccessKey, SecretKey string, req *http.Request) {
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// Set date
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date := time.Now().UTC().Format(time.RFC1123)
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req.Header.Set("Date", date)
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// Sort out URI
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uri := req.URL.EscapedPath()
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if uri == "" {
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uri = "/"
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}
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// Look through headers of interest
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var md5 string
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var contentType string
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var headersToSign []string
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tmpHeadersToSign := make(map[string][]string)
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for k, v := range req.Header {
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k = strings.ToLower(k)
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switch k {
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case "content-md5":
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md5 = v[0]
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case "content-type":
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contentType = v[0]
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default:
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if strings.HasPrefix(k, "x-amz-") {
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tmpHeadersToSign[k] = v
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}
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}
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}
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var keys []string
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for k := range tmpHeadersToSign {
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keys = append(keys, k)
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}
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// https://docs.aws.amazon.com/AmazonS3/latest/dev/RESTAuthentication.html
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sort.Strings(keys)
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for _, key := range keys {
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vall := strings.Join(tmpHeadersToSign[key], ",")
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headersToSign = append(headersToSign, key+":"+vall)
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}
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// Make headers of interest into canonical string
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var joinedHeadersToSign string
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if len(headersToSign) > 0 {
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joinedHeadersToSign = strings.Join(headersToSign, "\n") + "\n"
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}
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// Look for query parameters which need to be added to the signature
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params := req.URL.Query()
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var queriesToSign []string
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for k, vs := range params {
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if _, ok := s3ParamsToSign[k]; ok {
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for _, v := range vs {
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if v == "" {
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queriesToSign = append(queriesToSign, k)
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} else {
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queriesToSign = append(queriesToSign, k+"="+v)
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}
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}
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}
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}
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// Add query parameters to URI
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if len(queriesToSign) > 0 {
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sort.StringSlice(queriesToSign).Sort()
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uri += "?" + strings.Join(queriesToSign, "&")
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}
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// Make signature
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payload := req.Method + "\n" + md5 + "\n" + contentType + "\n" + date + "\n" + joinedHeadersToSign + uri
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hash := hmac.New(sha1.New, []byte(SecretKey))
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_, _ = hash.Write([]byte(payload))
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signature := make([]byte, base64.StdEncoding.EncodedLen(hash.Size()))
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base64.StdEncoding.Encode(signature, hash.Sum(nil))
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// Set signature in request
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req.Header.Set("Authorization", "AWS "+AccessKey+":"+string(signature))
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}
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