3c7aee142d
Signed-off-by: Vartan Benohanian <vartanbeno@gmail.com>
201 lines
4.9 KiB
Go
201 lines
4.9 KiB
Go
package geddit
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import (
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"bytes"
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"context"
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"encoding/json"
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"fmt"
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"io"
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"io/ioutil"
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"net/http"
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"net/url"
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)
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const (
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libraryVersion = "0.0.1"
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defaultBaseURL = "https://reddit.com"
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defaultBaseURLOauth = "https://oauth.reddit.com"
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userAgent = "geddit/" + libraryVersion
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mediaType = "application/json"
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headerContentType = "Content-Type"
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headerAccept = "Accept"
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headerUserAgent = "User-Agent"
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)
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// RequestCompletionCallback defines the type of the request callback function
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type RequestCompletionCallback func(*http.Request, *http.Response)
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// Client manages communication with the Reddit API
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type Client struct {
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// HTTP client used to communicate with the Reddit API
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client *http.Client
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// Base URL for HTTP requests
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BaseURL *url.URL
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UserAgent string
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Subreddit SubredditService
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onRequestCompleted RequestCompletionCallback
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}
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// OnRequestCompleted sets the client's request completion callback
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func (c *Client) OnRequestCompleted(rc RequestCompletionCallback) {
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c.onRequestCompleted = rc
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}
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func newClient(httpClient *http.Client) *Client {
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if httpClient == nil {
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httpClient = &http.Client{}
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}
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baseURL, _ := url.Parse(defaultBaseURL)
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c := &Client{client: httpClient, BaseURL: baseURL, UserAgent: userAgent}
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c.Subreddit = &SubredditServiceOp{client: c}
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return c
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}
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// New returns a client that can make requests to the Reddit API
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func New(httpClient *http.Client, opts ...Opt) (c *Client, err error) {
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c = newClient(httpClient)
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for _, opt := range opts {
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if err = opt(c); err != nil {
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return
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}
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}
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return
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}
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// NewRequest creates an API request
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// The path is the relative URL which will be resolves to the BaseURL of the Client
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// It should always be specified without a preceding slash
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func (c *Client) NewRequest(method, path string, body interface{}) (*http.Request, error) {
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u, err := c.BaseURL.Parse(path)
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if err != nil {
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return nil, err
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}
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buf := new(bytes.Buffer)
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if body != nil {
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err = json.NewEncoder(buf).Encode(body)
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if err != nil {
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return nil, err
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}
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}
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reqBody := bytes.NewReader(buf.Bytes())
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req, err := http.NewRequest(method, u.String(), reqBody)
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if err != nil {
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return nil, err
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}
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req.Header.Add(headerContentType, mediaType)
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req.Header.Add(headerAccept, mediaType)
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req.Header.Add(headerUserAgent, c.UserAgent)
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return req, nil
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}
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// Response is a PlayNetwork response. This wraps the standard http.Response returned from PlayNetwork.
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type Response struct {
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*http.Response
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}
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// newResponse creates a new Response for the provided http.Response
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func newResponse(r *http.Response) *Response {
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response := Response{Response: r}
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return &response
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}
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// Do sends an API request and returns the API response. The API response is JSON decoded and stored in the value
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// pointed to by v, or returned as an error if an API error has occurred. If v implements the io.Writer interface,
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// the raw response will be written to v, without attempting to decode it.
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func (c *Client) Do(ctx context.Context, req *http.Request, v interface{}) (*Response, error) {
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resp, err := DoRequestWithClient(ctx, c.client, req)
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if err != nil {
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return nil, err
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}
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if c.onRequestCompleted != nil {
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c.onRequestCompleted(req, resp)
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}
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response := newResponse(resp)
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defer func() {
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if rerr := response.Body.Close(); err == nil {
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err = rerr
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}
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}()
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err = CheckResponse(resp)
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if err != nil {
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return response, err
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}
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if v != nil {
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if w, ok := v.(io.Writer); ok {
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_, err = io.Copy(w, response.Body)
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if err != nil {
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return nil, err
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}
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} else {
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err = json.NewDecoder(response.Body).Decode(v)
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if err != nil {
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return nil, err
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}
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}
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}
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return response, err
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}
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// DoRequest submits an HTTP request.
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func DoRequest(ctx context.Context, req *http.Request) (*http.Response, error) {
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return DoRequestWithClient(ctx, http.DefaultClient, req)
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}
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// DoRequestWithClient submits an HTTP request using the specified client.
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func DoRequestWithClient(ctx context.Context, client *http.Client, req *http.Request) (*http.Response, error) {
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req = req.WithContext(ctx)
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return client.Do(req)
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}
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// An ErrorResponse reports the error caused by an API request
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type ErrorResponse struct {
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// HTTP response that caused this error
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Response *http.Response
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// Error message
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Message string `json:"message"`
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}
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func (r *ErrorResponse) Error() string {
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return fmt.Sprintf(
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"%v %v: %d %v",
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r.Response.Request.Method, r.Response.Request.URL, r.Response.StatusCode, r.Message,
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)
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}
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// CheckResponse checks the API response for errors, and returns them if present.
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// A response is considered an error if it has a status code outside the 200 range.
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func CheckResponse(r *http.Response) error {
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if c := r.StatusCode; c >= 200 && c <= 299 {
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return nil
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}
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errorResponse := &ErrorResponse{Response: r}
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data, err := ioutil.ReadAll(r.Body)
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if err == nil && len(data) > 0 {
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err := json.Unmarshal(data, errorResponse)
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if err != nil {
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errorResponse.Message = string(data)
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}
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}
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return errorResponse
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}
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