/
api.go
181 lines (149 loc) · 3.59 KB
/
api.go
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package main
import (
"encoding/json"
"errors"
"fmt"
"github.com/catalinc/hashcash"
"io/ioutil"
"net/http"
"net/url"
"os/exec"
"strings"
)
var apiToken string
func proofOfWork(name string) (string, error) {
var bits uint = 20
// the hashcash command is (apparently) faster than the pure golang implementation
cmd := exec.Command("hashcash", []string{"-b", fmt.Sprintf("%d", bits), "-qm", name}...)
cmdOut, err := cmd.Output()
if err != nil {
h := hashcash.New(bits, 8, "")
return h.Mint(name)
}
return strings.TrimSpace(string(cmdOut)), nil
}
func endpoint(path string) string {
u, err := url.Parse(path)
if err != nil {
log.Fatal(err)
}
if err != nil {
log.Fatal(err)
}
return ximeraUrl.ResolveReference(u).String()
}
func requestToken(keyId string) (string, error) {
log.Debug("Using keyid " + keyId)
url := endpoint("/gpg/token/" + keyId)
response, err := http.Get(url)
if err != nil {
return "", err
}
defer response.Body.Close()
if response.StatusCode != 200 {
bodyBytes, err := ioutil.ReadAll(response.Body)
if err != nil {
return "", err
}
bodyString := string(bodyBytes)
return "", errors.New(bodyString)
}
challenge, err := Decrypt(response.Body)
if err != nil {
return "", errors.New("Could not decrypt the challenge at " + url)
}
return challenge, nil
}
func RequestLtiSecret(keyId string, ltiKey string) (string, error) {
log.Debug("Using GPG key with fingerprint " + keyId)
url := endpoint("/gpg/secret/" + ltiKey + "/" + keyId)
response, err := http.Get(url)
if err != nil {
return "", err
}
defer response.Body.Close()
if response.StatusCode != 200 {
bodyBytes, err := ioutil.ReadAll(response.Body)
if err != nil {
return "", err
}
bodyString := string(bodyBytes)
return "", errors.New(bodyString)
}
challenge, err := Decrypt(response.Body)
if err != nil {
return "", errors.New("Could not decrypt the secret at " + url)
}
return challenge, nil
}
func saveToken() (err error) {
log.Debug("Saving token using fingerprint " + keyFingerprint)
apiToken, err = requestToken(keyFingerprint)
return
}
func authorize(req *http.Request) error {
if apiToken == "" {
err := saveToken()
if err != nil {
return err
}
}
header := "Bearer " + apiToken
log.Debug("Authorization: " + header)
req.Header.Add("Authorization", header)
return nil
}
func request(verb string, path string) (resp *http.Response, err error) {
client := &http.Client{}
req, err := http.NewRequest(verb, endpoint(path), nil)
if err != nil {
return nil, err
}
err = authorize(req)
if err != nil {
return nil, err
}
u, _ := url.Parse(path)
stamp, _ := proofOfWork(u.Path)
if len(stamp) > 0 {
req.Header.Add("X-Hashcash", stamp)
}
return client.Do(req)
}
func get(url string) (resp *http.Response, err error) {
return request("GET", url)
}
func post(url string) (resp *http.Response, err error) {
return request("POST", url)
}
func GetRepositoryUrl(repositoryName string) string {
return endpoint(repositoryName + ".git")
}
func GetRepositoryToken(repositoryName string) (string, error) {
response, err := post(repositoryName + ".git")
if err != nil {
return "", err
}
if response.StatusCode != 200 {
bodyBytes, err := ioutil.ReadAll(response.Body)
if err != nil {
return "", err
}
bodyString := string(bodyBytes)
return "", errors.New(bodyString)
}
dec := json.NewDecoder(response.Body)
for {
var v map[string]interface{}
if err := dec.Decode(&v); err != nil {
return "", err
} else {
if token, ok := v["token"]; ok {
if str, ok := token.(string); ok {
return str, nil
}
}
}
}
return "", err
}