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package api
import (
"context"
"encoding/json"
"errors"
"fmt"
"io"
"net/http"
"regexp"
"strings"
ghAPI "github.com/cli/go-gh/v2/pkg/api"
ghauth "github.com/cli/go-gh/v2/pkg/auth"
)
const (
accept = "Accept"
authorization = "Authorization"
cacheTTL = "X-GH-CACHE-TTL"
graphqlFeatures = "GraphQL-Features"
features = "merge_queue"
userAgent = "User-Agent"
)
var linkRE = regexp.MustCompile(`<([^>]+)>;\s*rel="([^"]+)"`)
func NewClientFromHTTP(httpClient *http.Client) *Client {
client := &Client{http: httpClient}
return client
}
type Client struct {
http *http.Client
}
func (c *Client) HTTP() *http.Client {
return c.http
}
type GraphQLError struct {
*ghAPI.GraphQLError
}
type HTTPError struct {
*ghAPI.HTTPError
scopesSuggestion string
}
func (err HTTPError) ScopesSuggestion() string {
return err.scopesSuggestion
}
// GraphQL performs a GraphQL request using the query string and parses the response into data receiver. If there are errors in the response,
// GraphQLError will be returned, but the receiver will also be partially populated.
func (c Client) GraphQL(hostname string, query string, variables map[string]interface{}, data interface{}) error {
opts := clientOptions(hostname, c.http.Transport)
opts.Headers[graphqlFeatures] = features
gqlClient, err := ghAPI.NewGraphQLClient(opts)
if err != nil {
return err
}
return handleResponse(gqlClient.Do(query, variables, data))
}
// Mutate performs a GraphQL mutation based on a struct and parses the response with the same struct as the receiver. If there are errors in the response,
// GraphQLError will be returned, but the receiver will also be partially populated.
func (c Client) Mutate(hostname, name string, mutation interface{}, variables map[string]interface{}) error {
opts := clientOptions(hostname, c.http.Transport)
opts.Headers[graphqlFeatures] = features
gqlClient, err := ghAPI.NewGraphQLClient(opts)
if err != nil {
return err
}
return handleResponse(gqlClient.Mutate(name, mutation, variables))
}
// Query performs a GraphQL query based on a struct and parses the response with the same struct as the receiver. If there are errors in the response,
// GraphQLError will be returned, but the receiver will also be partially populated.
func (c Client) Query(hostname, name string, query interface{}, variables map[string]interface{}) error {
opts := clientOptions(hostname, c.http.Transport)
opts.Headers[graphqlFeatures] = features
gqlClient, err := ghAPI.NewGraphQLClient(opts)
if err != nil {
return err
}
return handleResponse(gqlClient.Query(name, query, variables))
}
// QueryWithContext performs a GraphQL query based on a struct and parses the response with the same struct as the receiver. If there are errors in the response,
// GraphQLError will be returned, but the receiver will also be partially populated.
func (c Client) QueryWithContext(ctx context.Context, hostname, name string, query interface{}, variables map[string]interface{}) error {
opts := clientOptions(hostname, c.http.Transport)
opts.Headers[graphqlFeatures] = features
gqlClient, err := ghAPI.NewGraphQLClient(opts)
if err != nil {
return err
}
return handleResponse(gqlClient.QueryWithContext(ctx, name, query, variables))
}
// REST performs a REST request and parses the response.
func (c Client) REST(hostname string, method string, p string, body io.Reader, data interface{}) error {
opts := clientOptions(hostname, c.http.Transport)
restClient, err := ghAPI.NewRESTClient(opts)
if err != nil {
return err
}
return handleResponse(restClient.Do(method, p, body, data))
}
func (c Client) RESTWithNext(hostname string, method string, p string, body io.Reader, data interface{}) (string, error) {
opts := clientOptions(hostname, c.http.Transport)
restClient, err := ghAPI.NewRESTClient(opts)
if err != nil {
return "", err
}
resp, err := restClient.Request(method, p, body)
if err != nil {
return "", err
}
defer resp.Body.Close()
success := resp.StatusCode >= 200 && resp.StatusCode < 300
if !success {
return "", HandleHTTPError(resp)
}
if resp.StatusCode == http.StatusNoContent {
return "", nil
}
b, err := io.ReadAll(resp.Body)
if err != nil {
return "", err
}
err = json.Unmarshal(b, &data)
if err != nil {
return "", err
}
var next string
for _, m := range linkRE.FindAllStringSubmatch(resp.Header.Get("Link"), -1) {
if len(m) > 2 && m[2] == "next" {
next = m[1]
}
}
return next, nil
}
// HandleHTTPError parses a http.Response into a HTTPError.
func HandleHTTPError(resp *http.Response) error {
return handleResponse(ghAPI.HandleHTTPError(resp))
}
// handleResponse takes a ghAPI.HTTPError or ghAPI.GraphQLError and converts it into an
// HTTPError or GraphQLError respectively.
func handleResponse(err error) error {
if err == nil {
return nil
}
var restErr *ghAPI.HTTPError
if errors.As(err, &restErr) {
return HTTPError{
HTTPError: restErr,
scopesSuggestion: generateScopesSuggestion(restErr.StatusCode,
restErr.Headers.Get("X-Accepted-Oauth-Scopes"),
restErr.Headers.Get("X-Oauth-Scopes"),
restErr.RequestURL.Hostname()),
}
}
var gqlErr *ghAPI.GraphQLError
if errors.As(err, &gqlErr) {
return GraphQLError{
GraphQLError: gqlErr,
}
}
return err
}
// ScopesSuggestion is an error messaging utility that prints the suggestion to request additional OAuth
// scopes in case a server response indicates that there are missing scopes.
func ScopesSuggestion(resp *http.Response) string {
return generateScopesSuggestion(resp.StatusCode,
resp.Header.Get("X-Accepted-Oauth-Scopes"),
resp.Header.Get("X-Oauth-Scopes"),
resp.Request.URL.Hostname())
}
// EndpointNeedsScopes adds additional OAuth scopes to an HTTP response as if they were returned from the
// server endpoint. This improves HTTP 4xx error messaging for endpoints that don't explicitly list the
// OAuth scopes they need.
func EndpointNeedsScopes(resp *http.Response, s string) *http.Response {
if resp.StatusCode >= 400 && resp.StatusCode < 500 {
oldScopes := resp.Header.Get("X-Accepted-Oauth-Scopes")
resp.Header.Set("X-Accepted-Oauth-Scopes", fmt.Sprintf("%s, %s", oldScopes, s))
}
return resp
}
func generateScopesSuggestion(statusCode int, endpointNeedsScopes, tokenHasScopes, hostname string) string {
if statusCode < 400 || statusCode > 499 || statusCode == 422 {
return ""
}
if tokenHasScopes == "" {
return ""
}
gotScopes := map[string]struct{}{}
for _, s := range strings.Split(tokenHasScopes, ",") {
s = strings.TrimSpace(s)
gotScopes[s] = struct{}{}
// Certain scopes may be grouped under a single "top-level" scope. The following branch
// statements include these grouped/implied scopes when the top-level scope is encountered.
// See https://docs.github.com/en/developers/apps/building-oauth-apps/scopes-for-oauth-apps.
if s == "repo" {
gotScopes["repo:status"] = struct{}{}
gotScopes["repo_deployment"] = struct{}{}
gotScopes["public_repo"] = struct{}{}
gotScopes["repo:invite"] = struct{}{}
gotScopes["security_events"] = struct{}{}
} else if s == "user" {
gotScopes["read:user"] = struct{}{}
gotScopes["user:email"] = struct{}{}
gotScopes["user:follow"] = struct{}{}
} else if s == "codespace" {
gotScopes["codespace:secrets"] = struct{}{}
} else if strings.HasPrefix(s, "admin:") {
gotScopes["read:"+strings.TrimPrefix(s, "admin:")] = struct{}{}
gotScopes["write:"+strings.TrimPrefix(s, "admin:")] = struct{}{}
} else if strings.HasPrefix(s, "write:") {
gotScopes["read:"+strings.TrimPrefix(s, "write:")] = struct{}{}
}
}
for _, s := range strings.Split(endpointNeedsScopes, ",") {
s = strings.TrimSpace(s)
if _, gotScope := gotScopes[s]; s == "" || gotScope {
continue
}
return fmt.Sprintf(
"This API operation needs the %[1]q scope. To request it, run: gh auth refresh -h %[2]s -s %[1]s",
s,
ghauth.NormalizeHostname(hostname),
)
}
return ""
}
func clientOptions(hostname string, transport http.RoundTripper) ghAPI.ClientOptions {
// AuthToken, and Headers are being handled by transport,
// so let go-gh know that it does not need to resolve them.
opts := ghAPI.ClientOptions{
AuthToken: "none",
Headers: map[string]string{
authorization: "",
},
Host: hostname,
SkipDefaultHeaders: true,
Transport: transport,
LogIgnoreEnv: true,
}
return opts
}
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