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writeas.go
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writeas.go
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// Package writeas provides the binding for the Write.as API
package writeas
import (
"bytes"
"encoding/json"
"fmt"
"github.com/writeas/impart"
"io"
"net/http"
"time"
)
const (
apiURL = "https://write.as/api"
)
// Client is used to interact with the Write.as API. It can be used to make
// authenticated or unauthenticated calls.
type Client struct {
baseURL string
// Access token for the user making requests.
token string
// Client making requests to the API
client *http.Client
}
// defaultHTTPTimeout is the default http.Client timeout.
const defaultHTTPTimeout = 10 * time.Second
// NewClient creates a new API client. By default, all requests are made
// unauthenticated. To optionally make authenticated requests, call `SetToken`.
//
// c := writeas.NewClient()
// c.SetToken("00000000-0000-0000-0000-000000000000")
func NewClient() *Client {
return &Client{
client: &http.Client{Timeout: defaultHTTPTimeout},
baseURL: apiURL,
}
}
// SetToken sets the user token for all future Client requests. Setting this to
// an empty string will change back to unauthenticated requests.
func (c *Client) SetToken(token string) {
c.token = token
}
func (c *Client) get(path string, r interface{}) (*impart.Envelope, error) {
method := "GET"
if method != "GET" && method != "HEAD" {
return nil, fmt.Errorf("Method %s not currently supported by library (only HEAD and GET).\n", method)
}
return c.request(method, path, nil, r)
}
func (c *Client) post(path string, data, r interface{}) (*impart.Envelope, error) {
b := new(bytes.Buffer)
json.NewEncoder(b).Encode(data)
return c.request("POST", path, b, r)
}
func (c *Client) put(path string, data, r interface{}) (*impart.Envelope, error) {
b := new(bytes.Buffer)
json.NewEncoder(b).Encode(data)
return c.request("PUT", path, b, r)
}
func (c *Client) delete(path string, data map[string]string) (*impart.Envelope, error) {
r, err := c.buildRequest("DELETE", path, nil)
if err != nil {
return nil, err
}
q := r.URL.Query()
for k, v := range data {
q.Add(k, v)
}
r.URL.RawQuery = q.Encode()
return c.doRequest(r, nil)
}
func (c *Client) request(method, path string, data io.Reader, result interface{}) (*impart.Envelope, error) {
r, err := c.buildRequest(method, path, data)
if err != nil {
return nil, err
}
return c.doRequest(r, result)
}
func (c *Client) buildRequest(method, path string, data io.Reader) (*http.Request, error) {
url := fmt.Sprintf("%s%s", c.baseURL, path)
r, err := http.NewRequest(method, url, data)
if err != nil {
return nil, fmt.Errorf("Create request: %v", err)
}
c.prepareRequest(r)
return r, nil
}
func (c *Client) doRequest(r *http.Request, result interface{}) (*impart.Envelope, error) {
resp, err := c.client.Do(r)
if err != nil {
return nil, fmt.Errorf("Request: %v", err)
}
defer resp.Body.Close()
env := &impart.Envelope{
Code: resp.StatusCode,
}
if result != nil {
env.Data = result
err = json.NewDecoder(resp.Body).Decode(&env)
if err != nil {
return nil, err
}
}
return env, nil
}
func (c *Client) prepareRequest(r *http.Request) {
r.Header.Add("User-Agent", "go-writeas v1")
r.Header.Add("Content-Type", "application/json")
if c.token != "" {
r.Header.Add("Authorization", "Token "+c.token)
}
}

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