/*
Copyright 2017 Ollivier Robert
Copyright 2017 Mikael Berthe
Licensed under the MIT license. Please see the LICENSE file is this directory.
*/
package gondole
import (
"bytes"
"encoding/json"
"fmt"
"net/http"
"net/url"
"strings"
"github.com/sendgrid/rest"
)
// restAPI actually does the HTTP query
// It is a copy of rest.API with better handling of parameters with multiple values
func restAPI(request rest.Request) (*rest.Response, error) {
c := &rest.Client{HTTPClient: http.DefaultClient}
// Build the HTTP request object.
if len(request.QueryParams) != 0 {
// Add parameters to the URL
request.BaseURL += "?"
urlp := url.Values{}
for key, value := range request.QueryParams {
// It seems Mastodon doesn't like parameters with index
// numbers, but it needs the brackets.
// Let's check if the key matches '^.+\[.*\]$'
klen := len(key)
if klen == 0 {
continue
}
i := strings.Index(key, "[")
if key[klen-1] == ']' && i > 0 {
// This is an array, let's remove the index number
key = key[:i] + "[]"
}
urlp.Add(key, value)
}
urlpstr := urlp.Encode()
request.BaseURL += urlpstr
}
req, err := http.NewRequest(string(request.Method), request.BaseURL, bytes.NewBuffer(request.Body))
if err != nil {
return nil, err
}
for key, value := range request.Headers {
req.Header.Set(key, value)
}
_, exists := req.Header["Content-Type"]
if len(request.Body) > 0 && !exists {
req.Header.Set("Content-Type", "application/json")
}
// Build the HTTP client and make the request.
res, err := c.MakeRequest(req)
if err != nil {
return nil, err
}
// Build Response object.
response, err := rest.BuildResponse(res)
if err != nil {
return nil, err
}
return response, nil
}
// prepareRequest inserts all pre-defined stuff
func (g *Client) prepareRequest(target string, method rest.Method, params apiCallParams) (rest.Request, error) {
var req rest.Request
if g == nil {
return req, fmt.Errorf("use of uninitialized gondole client")
}
endPoint := g.APIBase + "/" + target
// Request headers
hdrs := make(map[string]string)
hdrs["User-Agent"] = fmt.Sprintf("Gondole/%s", GondoleVersion)
if g.UserToken != nil {
hdrs["Authorization"] = fmt.Sprintf("Bearer %s", g.UserToken.AccessToken)
}
req = rest.Request{
BaseURL: endPoint,
Headers: hdrs,
Method: method,
QueryParams: params,
}
return req, nil
}
// apiCall makes a call to the Mastodon API server
func (g *Client) apiCall(endPoint string, method rest.Method, params apiCallParams, data interface{}) error {
if g == nil {
return fmt.Errorf("use of uninitialized gondole client")
}
// Prepare query
req, err := g.prepareRequest(endPoint, method, params)
if err != nil {
return err
}
// Make API call
r, err := restAPI(req)
if err != nil {
return fmt.Errorf("API query (%s) failed: %s", endPoint, err.Error())
}
// Check for error reply
var errorResult Error
if err := json.Unmarshal([]byte(r.Body), &errorResult); err == nil {
// The empty object is not an error
if errorResult.Text != "" {
return fmt.Errorf("%s", errorResult.Text)
}
}
// Not an error reply; let's unmarshal the data
err = json.Unmarshal([]byte(r.Body), &data)
if err != nil {
return fmt.Errorf("cannot decode API response (%s): %s", method, err.Error())
}
return nil
}