Create basic API library with config

api.go

@@ -0,0 +1,115 @@
+// Package as provides basic functions for any *.as API library
+package as
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"github.com/writeas/impart"
+	"io"
+	"net/http"
+)
+
+type Client struct {
+	Config *ClientConfig
+	Token  string
+}
+
+func NewClient(cfg *ClientConfig) *Client {
+	return &Client{
+		Config: cfg,
+		Token:  "",
+	}
+}
+
+// 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.Config.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.Config.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)
+	}
+}

config.go

@@ -0,0 +1,25 @@
+package as
+
+import (
+	"net/http"
+	"time"
+)
+
+// defaultHTTPTimeout is the default http.Client timeout.
+const defaultHTTPTimeout = 10 * time.Second
+
+// ClientConfig contains API configuration
+type ClientConfig struct {
+	// BaseURL of the API we're talking to
+	BaseURL string
+
+	// Client making requests to the API
+	Client *http.Client
+}
+
+func NewClientConfig() *ClientConfig {
+	return &ClientConfig{
+		BaseURL: "",
+		Client:  &http.Client{Timeout: defaultHTTPTimeout},
+	}
+}