371 lines
7.9 KiB
Go
371 lines
7.9 KiB
Go
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package oauth
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import (
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"crypto"
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"crypto/hmac"
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_ "crypto/sha1"
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"encoding/base64"
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"fmt"
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"math/rand"
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"net/url"
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"os"
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"sort"
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"strconv"
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"sync"
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"time"
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)
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const (
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OAUTH_VERSION = "1.0"
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SIGNATURE_METHOD_HMAC = "HMAC-"
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HTTP_AUTH_HEADER = "Authorization"
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OAUTH_HEADER = "OAuth "
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CONSUMER_KEY_PARAM = "oauth_consumer_key"
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NONCE_PARAM = "oauth_nonce"
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SIGNATURE_METHOD_PARAM = "oauth_signature_method"
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SIGNATURE_PARAM = "oauth_signature"
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TIMESTAMP_PARAM = "oauth_timestamp"
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TOKEN_PARAM = "oauth_token"
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TOKEN_SECRET_PARAM = "oauth_token_secret"
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VERSION_PARAM = "oauth_version"
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)
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var HASH_METHOD_MAP = map[crypto.Hash]string{
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crypto.SHA1: "SHA1",
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crypto.SHA256: "SHA256",
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}
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// Creates a new Consumer instance, with a HMAC-SHA1 signer
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func NewConsumer(consumerKey string, consumerSecret string, requestMethod string, requestURL string) *Consumer {
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clock := &defaultClock{}
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consumer := &Consumer{
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consumerKey: consumerKey,
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consumerSecret: consumerSecret,
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requestMethod: requestMethod,
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requestURL: requestURL,
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clock: clock,
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nonceGenerator: newLockedNonceGenerator(clock),
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AdditionalParams: make(map[string]string),
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}
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consumer.signer = &HMACSigner{
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consumerSecret: consumerSecret,
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hashFunc: crypto.SHA1,
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}
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return consumer
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}
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// lockedNonceGenerator wraps a non-reentrant random number generator with alock
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type lockedNonceGenerator struct {
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nonceGenerator nonceGenerator
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lock sync.Mutex
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}
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func newLockedNonceGenerator(c clock) *lockedNonceGenerator {
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return &lockedNonceGenerator{
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nonceGenerator: rand.New(rand.NewSource(c.Nanos())),
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}
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}
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func (n *lockedNonceGenerator) Int63() int64 {
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n.lock.Lock()
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r := n.nonceGenerator.Int63()
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n.lock.Unlock()
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return r
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}
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type clock interface {
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Seconds() int64
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Nanos() int64
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}
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type nonceGenerator interface {
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Int63() int64
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}
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type signer interface {
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Sign(message string) (string, error)
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Verify(message string, signature string) error
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SignatureMethod() string
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HashFunc() crypto.Hash
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Debug(enabled bool)
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}
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type defaultClock struct{}
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func (*defaultClock) Seconds() int64 {
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return time.Now().Unix()
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}
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func (*defaultClock) Nanos() int64 {
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return time.Now().UnixNano()
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}
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type Consumer struct {
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AdditionalParams map[string]string
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// The rest of this class is configured via the NewConsumer function.
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consumerKey string
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consumerSecret string
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requestMethod string
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requestURL string
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debug bool
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// Private seams for mocking dependencies when testing
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clock clock
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// Seeded generators are not reentrant
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nonceGenerator nonceGenerator
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signer signer
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}
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type HMACSigner struct {
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consumerSecret string
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hashFunc crypto.Hash
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debug bool
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}
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func (s *HMACSigner) Debug(enabled bool) {
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s.debug = enabled
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}
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func (s *HMACSigner) Sign(message string) (string, error) {
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key := escape(s.consumerSecret)
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if s.debug {
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fmt.Println("Signing:", message)
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fmt.Println("Key:", key)
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}
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h := hmac.New(s.HashFunc().New, []byte(key+"&"))
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h.Write([]byte(message))
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rawSignature := h.Sum(nil)
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base64signature := base64.StdEncoding.EncodeToString(rawSignature)
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if s.debug {
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fmt.Println("Base64 signature:", base64signature)
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}
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return base64signature, nil
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}
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func (s *HMACSigner) Verify(message string, signature string) error {
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if s.debug {
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fmt.Println("Verifying Base64 signature:", signature)
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}
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validSignature, err := s.Sign(message)
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if err != nil {
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return err
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}
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if validSignature != signature {
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decodedSigniture, _ := url.QueryUnescape(signature)
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if validSignature != decodedSigniture {
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return fmt.Errorf("signature did not match")
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}
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}
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return nil
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}
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func (s *HMACSigner) SignatureMethod() string {
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return SIGNATURE_METHOD_HMAC + HASH_METHOD_MAP[s.HashFunc()]
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}
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func (s *HMACSigner) HashFunc() crypto.Hash {
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return s.hashFunc
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}
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func escape(s string) string {
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t := make([]byte, 0, 3*len(s))
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for i := 0; i < len(s); i++ {
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c := s[i]
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if isEscapable(c) {
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t = append(t, '%')
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t = append(t, "0123456789ABCDEF"[c>>4])
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t = append(t, "0123456789ABCDEF"[c&15])
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} else {
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t = append(t, s[i])
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}
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}
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return string(t)
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}
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func isEscapable(b byte) bool {
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return !('A' <= b && b <= 'Z' || 'a' <= b && b <= 'z' || '0' <= b && b <= '9' || b == '-' || b == '.' || b == '_' || b == '~')
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}
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func (c *Consumer) Debug(enabled bool) {
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c.debug = enabled
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c.signer.Debug(enabled)
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}
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func (c *Consumer) GetRequestUrl() (loginUrl string, err error) {
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if os.Getenv("GO_ENV") == "development" {
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c.AdditionalParams["approachKey"] = c.consumerKey
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c.AdditionalParams["secretKey"] = c.consumerSecret
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}
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c.AdditionalParams["responseFormatType"] = "xml"
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params := c.baseParams(c.consumerKey, c.AdditionalParams)
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if c.debug {
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fmt.Println("params:", params)
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}
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req := &request{
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method: c.requestMethod,
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url: c.requestURL,
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oauthParams: params,
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}
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signature, err := c.signRequest(req)
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if err != nil {
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return "", err
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}
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result := req.url + "?"
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for pos, key := range req.oauthParams.Keys() {
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for innerPos, value := range req.oauthParams.Get(key) {
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if pos+innerPos != 0 {
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result += "&"
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}
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result += fmt.Sprintf("%s=%s", key, value)
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}
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}
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result += fmt.Sprintf("&%s=%s", SIGNATURE_PARAM, escape(signature))
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if c.debug {
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fmt.Println("req: ", result)
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}
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return result, nil
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}
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func (c *Consumer) baseParams(consumerKey string, additionalParams map[string]string) *OrderedParams {
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params := NewOrderedParams()
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params.Add(VERSION_PARAM, OAUTH_VERSION)
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params.Add(SIGNATURE_METHOD_PARAM, c.signer.SignatureMethod())
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params.Add(TIMESTAMP_PARAM, strconv.FormatInt(c.clock.Seconds(), 10))
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params.Add(NONCE_PARAM, strconv.FormatInt(c.nonceGenerator.Int63(), 10))
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params.Add(CONSUMER_KEY_PARAM, consumerKey)
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for key, value := range additionalParams {
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params.Add(key, value)
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}
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return params
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}
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func (c *Consumer) signRequest(req *request) (string, error) {
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baseString := c.requestString(req.method, req.url, req.oauthParams)
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if c.debug {
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fmt.Println("baseString: ", baseString)
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}
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signature, err := c.signer.Sign(baseString)
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if err != nil {
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return "", err
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}
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return signature, nil
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}
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func (c *Consumer) requestString(method string, url string, params *OrderedParams) string {
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result := method + "&" + escape(url)
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for pos, key := range params.Keys() {
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for innerPos, value := range params.Get(key) {
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if pos+innerPos == 0 {
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result += "&"
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} else {
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result += escape("&")
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}
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result += escape(fmt.Sprintf("%s=%s", key, value))
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}
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}
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return result
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}
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type request struct {
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method string
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url string
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oauthParams *OrderedParams
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userParams map[string]string
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}
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//
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// String Sorting helpers
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//
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type ByValue []string
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func (a ByValue) Len() int {
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return len(a)
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}
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func (a ByValue) Swap(i, j int) {
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a[i], a[j] = a[j], a[i]
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}
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func (a ByValue) Less(i, j int) bool {
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return a[i] < a[j]
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}
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//
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// ORDERED PARAMS
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//
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type OrderedParams struct {
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allParams map[string][]string
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keyOrdering []string
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}
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func NewOrderedParams() *OrderedParams {
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return &OrderedParams{
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allParams: make(map[string][]string),
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keyOrdering: make([]string, 0),
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}
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}
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func (o *OrderedParams) Get(key string) []string {
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sort.Sort(ByValue(o.allParams[key]))
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return o.allParams[key]
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}
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func (o *OrderedParams) Keys() []string {
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sort.Sort(o)
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return o.keyOrdering
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}
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func (o *OrderedParams) Add(key, value string) {
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o.AddUnescaped(key, escape(value))
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}
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func (o *OrderedParams) AddUnescaped(key, value string) {
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if _, exists := o.allParams[key]; !exists {
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o.keyOrdering = append(o.keyOrdering, key)
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o.allParams[key] = make([]string, 1)
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o.allParams[key][0] = value
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} else {
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o.allParams[key] = append(o.allParams[key], value)
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}
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}
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func (o *OrderedParams) Len() int {
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return len(o.keyOrdering)
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}
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func (o *OrderedParams) Less(i int, j int) bool {
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return o.keyOrdering[i] < o.keyOrdering[j]
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}
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func (o *OrderedParams) Swap(i int, j int) {
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o.keyOrdering[i], o.keyOrdering[j] = o.keyOrdering[j], o.keyOrdering[i]
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}
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