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package api
// For descriptions of service interfaces, see:
// - https://online.visualstudio.com/api/swagger (for visualstudio.com)
// - https://docs.github.com/en/rest/reference/repos (for api.github.com)
// - https://github.com/github/github/blob/master/app/api/codespaces.rb (for vscs_internal)
// TODO(adonovan): replace the last link with a public doc URL when available.
// TODO(adonovan): a possible reorganization would be to split this
// file into three internal packages, one per backend service, and to
// rename api.API to github.Client:
//
// - github.GetUser(github.Client)
// - github.GetRepository(Client)
// - github.ReadFile(Client, nwo, branch, path) // was GetCodespaceRepositoryContents
// - github.AuthorizedKeys(Client, user)
// - codespaces.Create(Client, user, repo, sku, branch, location)
// - codespaces.Delete(Client, user, token, name)
// - codespaces.Get(Client, token, owner, name)
// - codespaces.GetMachineTypes(Client, user, repo, branch, location)
// - codespaces.GetToken(Client, login, name)
// - codespaces.List(Client, user)
// - codespaces.Start(Client, token, codespace)
// - visualstudio.GetRegionLocation(http.Client) // no dependency on github
//
// This would make the meaning of each operation clearer.
import (
"bytes"
"context"
"encoding/base64"
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/url"
"reflect"
"regexp"
"strconv"
"strings"
"time"
"github.com/cli/cli/v2/api"
"github.com/opentracing/opentracing-go"
)
const (
githubServer = "https://github.com"
githubAPI = "https://api.github.com"
vscsAPI = "https://online.visualstudio.com"
)
// API is the interface to the codespace service.
type API struct {
client httpClient
vscsAPI string
githubAPI string
githubServer string
retryBackoff time.Duration
}
type httpClient interface {
Do(req *http.Request) (*http.Response, error)
}
// New creates a new API client connecting to the configured endpoints with the HTTP client.
func New(serverURL, apiURL, vscsURL string, httpClient httpClient) *API {
if serverURL == "" {
serverURL = githubServer
}
if apiURL == "" {
apiURL = githubAPI
}
if vscsURL == "" {
vscsURL = vscsAPI
}
return &API{
client: httpClient,
vscsAPI: strings.TrimSuffix(vscsURL, "/"),
githubAPI: strings.TrimSuffix(apiURL, "/"),
githubServer: strings.TrimSuffix(serverURL, "/"),
retryBackoff: 100 * time.Millisecond,
}
}
// User represents a GitHub user.
type User struct {
Login string `json:"login"`
}
// GetUser returns the user associated with the given token.
func (a *API) GetUser(ctx context.Context) (*User, error) {
req, err := http.NewRequest(http.MethodGet, a.githubAPI+"/user", nil)
if err != nil {
return nil, fmt.Errorf("error creating request: %w", err)
}
a.setHeaders(req)
resp, err := a.do(ctx, req, "/user")
if err != nil {
return nil, fmt.Errorf("error making request: %w", err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return nil, api.HandleHTTPError(resp)
}
b, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, fmt.Errorf("error reading response body: %w", err)
}
var response User
if err := json.Unmarshal(b, &response); err != nil {
return nil, fmt.Errorf("error unmarshaling response: %w", err)
}
return &response, nil
}
// Repository represents a GitHub repository.
type Repository struct {
ID int `json:"id"`
FullName string `json:"full_name"`
DefaultBranch string `json:"default_branch"`
}
// GetRepository returns the repository associated with the given owner and name.
func (a *API) GetRepository(ctx context.Context, nwo string) (*Repository, error) {
req, err := http.NewRequest(http.MethodGet, a.githubAPI+"/repos/"+strings.ToLower(nwo), nil)
if err != nil {
return nil, fmt.Errorf("error creating request: %w", err)
}
a.setHeaders(req)
resp, err := a.do(ctx, req, "/repos/*")
if err != nil {
return nil, fmt.Errorf("error making request: %w", err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return nil, api.HandleHTTPError(resp)
}
b, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, fmt.Errorf("error reading response body: %w", err)
}
var response Repository
if err := json.Unmarshal(b, &response); err != nil {
return nil, fmt.Errorf("error unmarshaling response: %w", err)
}
return &response, nil
}
// Codespace represents a codespace.
type Codespace struct {
Name string `json:"name"`
CreatedAt string `json:"created_at"`
LastUsedAt string `json:"last_used_at"`
Owner User `json:"owner"`
Repository Repository `json:"repository"`
State string `json:"state"`
GitStatus CodespaceGitStatus `json:"git_status"`
Connection CodespaceConnection `json:"connection"`
}
type CodespaceGitStatus struct {
Ahead int `json:"ahead"`
Behind int `json:"behind"`
Ref string `json:"ref"`
HasUnpushedChanges bool `json:"has_unpushed_changes"`
HasUncommitedChanges bool `json:"has_uncommited_changes"`
}
const (
// CodespaceStateAvailable is the state for a running codespace environment.
CodespaceStateAvailable = "Available"
// CodespaceStateShutdown is the state for a shutdown codespace environment.
CodespaceStateShutdown = "Shutdown"
// CodespaceStateStarting is the state for a starting codespace environment.
CodespaceStateStarting = "Starting"
)
type CodespaceConnection struct {
SessionID string `json:"sessionId"`
SessionToken string `json:"sessionToken"`
RelayEndpoint string `json:"relayEndpoint"`
RelaySAS string `json:"relaySas"`
HostPublicKeys []string `json:"hostPublicKeys"`
}
// CodespaceFields is the list of exportable fields for a codespace.
var CodespaceFields = []string{
"name",
"owner",
"repository",
"state",
"gitStatus",
"createdAt",
"lastUsedAt",
}
func (c *Codespace) ExportData(fields []string) map[string]interface{} {
v := reflect.ValueOf(c).Elem()
data := map[string]interface{}{}
for _, f := range fields {
switch f {
case "owner":
data[f] = c.Owner.Login
case "repository":
data[f] = c.Repository.FullName
case "gitStatus":
data[f] = map[string]interface{}{
"ref": c.GitStatus.Ref,
"hasUnpushedChanges": c.GitStatus.HasUnpushedChanges,
"hasUncommitedChanges": c.GitStatus.HasUncommitedChanges,
}
default:
sf := v.FieldByNameFunc(func(s string) bool {
return strings.EqualFold(f, s)
})
data[f] = sf.Interface()
}
}
return data
}
// ListCodespaces returns a list of codespaces for the user. Pass a negative limit to request all pages from
// the API until all codespaces have been fetched.
func (a *API) ListCodespaces(ctx context.Context, limit int) (codespaces []*Codespace, err error) {
perPage := 100
if limit > 0 && limit < 100 {
perPage = limit
}
listURL := fmt.Sprintf("%s/user/codespaces?per_page=%d", a.githubAPI, perPage)
for {
req, err := http.NewRequest(http.MethodGet, listURL, nil)
if err != nil {
return nil, fmt.Errorf("error creating request: %w", err)
}
a.setHeaders(req)
resp, err := a.do(ctx, req, "/user/codespaces")
if err != nil {
return nil, fmt.Errorf("error making request: %w", err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return nil, api.HandleHTTPError(resp)
}
var response struct {
Codespaces []*Codespace `json:"codespaces"`
}
dec := json.NewDecoder(resp.Body)
if err := dec.Decode(&response); err != nil {
return nil, fmt.Errorf("error unmarshaling response: %w", err)
}
nextURL := findNextPage(resp.Header.Get("Link"))
codespaces = append(codespaces, response.Codespaces...)
if nextURL == "" || (limit > 0 && len(codespaces) >= limit) {
break
}
if newPerPage := limit - len(codespaces); limit > 0 && newPerPage < 100 {
u, _ := url.Parse(nextURL)
q := u.Query()
q.Set("per_page", strconv.Itoa(newPerPage))
u.RawQuery = q.Encode()
listURL = u.String()
} else {
listURL = nextURL
}
}
return codespaces, nil
}
var linkRE = regexp.MustCompile(`<([^>]+)>;\s*rel="([^"]+)"`)
func findNextPage(linkValue string) string {
for _, m := range linkRE.FindAllStringSubmatch(linkValue, -1) {
if len(m) > 2 && m[2] == "next" {
return m[1]
}
}
return ""
}
// GetCodespace returns the user codespace based on the provided name.
// If the codespace is not found, an error is returned.
// If includeConnection is true, it will return the connection information for the codespace.
func (a *API) GetCodespace(ctx context.Context, codespaceName string, includeConnection bool) (*Codespace, error) {
resp, err := a.withRetry(func() (*http.Response, error) {
req, err := http.NewRequest(
http.MethodGet,
a.githubAPI+"/user/codespaces/"+codespaceName,
nil,
)
if err != nil {
return nil, fmt.Errorf("error creating request: %w", err)
}
if includeConnection {
q := req.URL.Query()
q.Add("internal", "true")
q.Add("refresh", "true")
req.URL.RawQuery = q.Encode()
}
a.setHeaders(req)
return a.do(ctx, req, "/user/codespaces/*")
})
if err != nil {
return nil, fmt.Errorf("error making request: %w", err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return nil, api.HandleHTTPError(resp)
}
b, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, fmt.Errorf("error reading response body: %w", err)
}
var response Codespace
if err := json.Unmarshal(b, &response); err != nil {
return nil, fmt.Errorf("error unmarshaling response: %w", err)
}
return &response, nil
}
// StartCodespace starts a codespace for the user.
// If the codespace is already running, the returned error from the API is ignored.
func (a *API) StartCodespace(ctx context.Context, codespaceName string) error {
resp, err := a.withRetry(func() (*http.Response, error) {
req, err := http.NewRequest(
http.MethodPost,
a.githubAPI+"/user/codespaces/"+codespaceName+"/start",
nil,
)
if err != nil {
return nil, fmt.Errorf("error creating request: %w", err)
}
a.setHeaders(req)
return a.do(ctx, req, "/user/codespaces/*/start")
})
if err != nil {
return fmt.Errorf("error making request: %w", err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
if resp.StatusCode == http.StatusConflict {
// 409 means the codespace is already running which we can safely ignore
return nil
}
return api.HandleHTTPError(resp)
}
return nil
}
func (a *API) StopCodespace(ctx context.Context, codespaceName string) error {
req, err := http.NewRequest(
http.MethodPost,
a.githubAPI+"/user/codespaces/"+codespaceName+"/stop",
nil,
)
if err != nil {
return fmt.Errorf("error creating request: %w", err)
}
a.setHeaders(req)
resp, err := a.do(ctx, req, "/user/codespaces/*/stop")
if err != nil {
return fmt.Errorf("error making request: %w", err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return api.HandleHTTPError(resp)
}
return nil
}
type getCodespaceRegionLocationResponse struct {
Current string `json:"current"`
}
// GetCodespaceRegionLocation returns the closest codespace location for the user.
func (a *API) GetCodespaceRegionLocation(ctx context.Context) (string, error) {
req, err := http.NewRequest(http.MethodGet, a.vscsAPI+"/api/v1/locations", nil)
if err != nil {
return "", fmt.Errorf("error creating request: %w", err)
}
resp, err := a.do(ctx, req, req.URL.String())
if err != nil {
return "", fmt.Errorf("error making request: %w", err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return "", api.HandleHTTPError(resp)
}
b, err := ioutil.ReadAll(resp.Body)
if err != nil {
return "", fmt.Errorf("error reading response body: %w", err)
}
var response getCodespaceRegionLocationResponse
if err := json.Unmarshal(b, &response); err != nil {
return "", fmt.Errorf("error unmarshaling response: %w", err)
}
return response.Current, nil
}
type Machine struct {
Name string `json:"name"`
DisplayName string `json:"display_name"`
PrebuildAvailability string `json:"prebuild_availability"`
}
// GetCodespacesMachines returns the codespaces machines for the given repo, branch and location.
func (a *API) GetCodespacesMachines(ctx context.Context, repoID int, branch, location string) ([]*Machine, error) {
reqURL := fmt.Sprintf("%s/repositories/%d/codespaces/machines", a.githubAPI, repoID)
req, err := http.NewRequest(http.MethodGet, reqURL, nil)
if err != nil {
return nil, fmt.Errorf("error creating request: %w", err)
}
q := req.URL.Query()
q.Add("location", location)
q.Add("ref", branch)
req.URL.RawQuery = q.Encode()
a.setHeaders(req)
resp, err := a.do(ctx, req, "/repositories/*/codespaces/machines")
if err != nil {
return nil, fmt.Errorf("error making request: %w", err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return nil, api.HandleHTTPError(resp)
}
b, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, fmt.Errorf("error reading response body: %w", err)
}
var response struct {
Machines []*Machine `json:"machines"`
}
if err := json.Unmarshal(b, &response); err != nil {
return nil, fmt.Errorf("error unmarshaling response: %w", err)
}
return response.Machines, nil
}
// RepoSearchParameters are the optional parameters for searching for repositories.
type RepoSearchParameters struct {
// The maximum number of repos to return. At most 100 repos are returned even if this value is greater than 100.
MaxRepos int
// The sort order for returned repos. Possible values are 'stars', 'forks', 'help-wanted-issues', or 'updated'. If empty the API's default ordering is used.
Sort string
}
// GetCodespaceRepoSuggestions searches for and returns repo names based on the provided search text.
func (a *API) GetCodespaceRepoSuggestions(ctx context.Context, partialSearch string, parameters RepoSearchParameters) ([]string, error) {
reqURL := fmt.Sprintf("%s/search/repositories", a.githubAPI)
req, err := http.NewRequest(http.MethodGet, reqURL, nil)
if err != nil {
return nil, fmt.Errorf("error creating request: %w", err)
}
parts := strings.SplitN(partialSearch, "/", 2)
var nameSearch string
if len(parts) == 2 {
user := parts[0]
repo := parts[1]
nameSearch = fmt.Sprintf("%s user:%s", repo, user)
} else {
/*
* This results in searching for the text within the owner or the name. It's possible to
* do an owner search and then look up some repos for those owners, but that adds a
* good amount of latency to the fetch which slows down showing the suggestions.
*/
nameSearch = partialSearch
}
queryStr := fmt.Sprintf("%s in:name", nameSearch)
q := req.URL.Query()
q.Add("q", queryStr)
if len(parameters.Sort) > 0 {
q.Add("sort", parameters.Sort)
}
if parameters.MaxRepos > 0 {
q.Add("per_page", strconv.Itoa(parameters.MaxRepos))
}
req.URL.RawQuery = q.Encode()
a.setHeaders(req)
resp, err := a.do(ctx, req, "/search/repositories/*")
if err != nil {
return nil, fmt.Errorf("error searching repositories: %w", err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return nil, api.HandleHTTPError(resp)
}
b, err := io.ReadAll(resp.Body)
if err != nil {
return nil, fmt.Errorf("error reading response body: %w", err)
}
var response struct {
Items []*Repository `json:"items"`
}
if err := json.Unmarshal(b, &response); err != nil {
return nil, fmt.Errorf("error unmarshaling response: %w", err)
}
repoNames := make([]string, len(response.Items))
for i, repo := range response.Items {
repoNames[i] = repo.FullName
}
return repoNames, nil
}
// CreateCodespaceParams are the required parameters for provisioning a Codespace.
type CreateCodespaceParams struct {
RepositoryID int
IdleTimeoutMinutes int
Branch string
Machine string
Location string
}
// CreateCodespace creates a codespace with the given parameters and returns a non-nil error if it
// fails to create.
func (a *API) CreateCodespace(ctx context.Context, params *CreateCodespaceParams) (*Codespace, error) {
codespace, err := a.startCreate(ctx, params)
if err != errProvisioningInProgress {
return codespace, err
}
// errProvisioningInProgress indicates that codespace creation did not complete
// within the GitHub API RPC time limit (10s), so it continues asynchronously.
// We must poll the server to discover the outcome.
ctx, cancel := context.WithTimeout(ctx, 2*time.Minute)
defer cancel()
ticker := time.NewTicker(1 * time.Second)
defer ticker.Stop()
for {
select {
case <-ctx.Done():
return nil, ctx.Err()
case <-ticker.C:
codespace, err = a.GetCodespace(ctx, codespace.Name, false)
if err != nil {
return nil, fmt.Errorf("failed to get codespace: %w", err)
}
// we continue to poll until the codespace shows as provisioned
if codespace.State != CodespaceStateAvailable {
continue
}
return codespace, nil
}
}
}
type startCreateRequest struct {
RepositoryID int `json:"repository_id"`
IdleTimeoutMinutes int `json:"idle_timeout_minutes,omitempty"`
Ref string `json:"ref"`
Location string `json:"location"`
Machine string `json:"machine"`
}
var errProvisioningInProgress = errors.New("provisioning in progress")
// startCreate starts the creation of a codespace.
// It may return success or an error, or errProvisioningInProgress indicating that the operation
// did not complete before the GitHub API's time limit for RPCs (10s), in which case the caller
// must poll the server to learn the outcome.
func (a *API) startCreate(ctx context.Context, params *CreateCodespaceParams) (*Codespace, error) {
if params == nil {
return nil, errors.New("startCreate missing parameters")
}
requestBody, err := json.Marshal(startCreateRequest{
RepositoryID: params.RepositoryID,
IdleTimeoutMinutes: params.IdleTimeoutMinutes,
Ref: params.Branch,
Location: params.Location,
Machine: params.Machine,
})
if err != nil {
return nil, fmt.Errorf("error marshaling request: %w", err)
}
req, err := http.NewRequest(http.MethodPost, a.githubAPI+"/user/codespaces", bytes.NewBuffer(requestBody))
if err != nil {
return nil, fmt.Errorf("error creating request: %w", err)
}
a.setHeaders(req)
resp, err := a.do(ctx, req, "/user/codespaces")
if err != nil {
return nil, fmt.Errorf("error making request: %w", err)
}
defer resp.Body.Close()
if resp.StatusCode == http.StatusAccepted {
return nil, errProvisioningInProgress // RPC finished before result of creation known
} else if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusCreated {
return nil, api.HandleHTTPError(resp)
}
b, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, fmt.Errorf("error reading response body: %w", err)
}
var response Codespace
if err := json.Unmarshal(b, &response); err != nil {
return nil, fmt.Errorf("error unmarshaling response: %w", err)
}
return &response, nil
}
// DeleteCodespace deletes the given codespace.
func (a *API) DeleteCodespace(ctx context.Context, codespaceName string) error {
req, err := http.NewRequest(http.MethodDelete, a.githubAPI+"/user/codespaces/"+codespaceName, nil)
if err != nil {
return fmt.Errorf("error creating request: %w", err)
}
a.setHeaders(req)
resp, err := a.do(ctx, req, "/user/codespaces/*")
if err != nil {
return fmt.Errorf("error making request: %w", err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusAccepted {
return api.HandleHTTPError(resp)
}
return nil
}
type getCodespaceRepositoryContentsResponse struct {
Content string `json:"content"`
}
func (a *API) GetCodespaceRepositoryContents(ctx context.Context, codespace *Codespace, path string) ([]byte, error) {
req, err := http.NewRequest(http.MethodGet, a.githubAPI+"/repos/"+codespace.Repository.FullName+"/contents/"+path, nil)
if err != nil {
return nil, fmt.Errorf("error creating request: %w", err)
}
q := req.URL.Query()
q.Add("ref", codespace.GitStatus.Ref)
req.URL.RawQuery = q.Encode()
a.setHeaders(req)
resp, err := a.do(ctx, req, "/repos/*/contents/*")
if err != nil {
return nil, fmt.Errorf("error making request: %w", err)
}
defer resp.Body.Close()
if resp.StatusCode == http.StatusNotFound {
return nil, nil
} else if resp.StatusCode != http.StatusOK {
return nil, api.HandleHTTPError(resp)
}
b, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, fmt.Errorf("error reading response body: %w", err)
}
var response getCodespaceRepositoryContentsResponse
if err := json.Unmarshal(b, &response); err != nil {
return nil, fmt.Errorf("error unmarshaling response: %w", err)
}
decoded, err := base64.StdEncoding.DecodeString(response.Content)
if err != nil {
return nil, fmt.Errorf("error decoding content: %w", err)
}
return decoded, nil
}
// AuthorizedKeys returns the public keys (in ~/.ssh/authorized_keys
// format) registered by the specified GitHub user.
func (a *API) AuthorizedKeys(ctx context.Context, user string) ([]byte, error) {
url := fmt.Sprintf("%s/%s.keys", a.githubServer, user)
req, err := http.NewRequest(http.MethodGet, url, nil)
if err != nil {
return nil, err
}
resp, err := a.do(ctx, req, "/user.keys")
if err != nil {
return nil, err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return nil, fmt.Errorf("server returned %s", resp.Status)
}
b, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, fmt.Errorf("error reading response body: %w", err)
}
return b, nil
}
// do executes the given request and returns the response. It creates an
// opentracing span to track the length of the request.
func (a *API) do(ctx context.Context, req *http.Request, spanName string) (*http.Response, error) {
// TODO(adonovan): use NewRequestWithContext(ctx) and drop ctx parameter.
span, ctx := opentracing.StartSpanFromContext(ctx, spanName)
defer span.Finish()
req = req.WithContext(ctx)
return a.client.Do(req)
}
// setHeaders sets the required headers for the API.
func (a *API) setHeaders(req *http.Request) {
req.Header.Set("Accept", "application/vnd.github.v3+json")
}
// withRetry takes a generic function that sends an http request and retries
// only when the returned response has a >=500 status code.
func (a *API) withRetry(f func() (*http.Response, error)) (resp *http.Response, err error) {
for i := 0; i < 5; i++ {
resp, err = f()
if err != nil {
return nil, err
}
if resp.StatusCode < 500 {
break
}
time.Sleep(a.retryBackoff * (time.Duration(i) + 1))
}
return resp, err
}