remove Client struct, use context values for API key, Work client ID and private key, and http Client

context.go

@@ -0,0 +1,67 @@
+package maps
+
+import (
+	"net/http"
+
+	"code.google.com/p/go.net/context"
+)
+
+type contextKey int
+
+// NewContext returns a new context that uses the provided http.Client and API key.
+func NewContext(key string, c *http.Client) context.Context {
+	return WithContext(context.Background(), key, c)
+}
+
+// WithContext returns a new context in a similar way NewContext does, but initiates the new context with the specified parent.
+func WithContext(parent context.Context, key string, c *http.Client) context.Context {
+	vals := map[string]interface{}{}
+	vals["key"] = key
+	vals["httpClient"] = c
+	return context.WithValue(parent, contextKey(0), vals)
+}
+
+// NewWorkContext returns a new context that uses the provided http.Client and Google Maps API for Work client ID and private key.
+func NewWorkContext(clientID, privateKey string, c *http.Client) context.Context {
+	return WithWorkCredentials(context.Background(), clientID, privateKey, c)
+}
+
+// WithWorkCredentials returns a new context in a similar way NewWorkContext does, but initiates the new context with the specified parent.
+func WithWorkCredentials(parent context.Context, clientID, privateKey string, c *http.Client) context.Context {
+	vals := map[string]interface{}{}
+	vals["workClientID"] = clientID
+	vals["workPrivKey"] = privateKey
+	vals["httpClient"] = c
+	return context.WithValue(parent, contextKey(0), vals)
+}
+
+func key(ctx context.Context) string {
+	k, found := ctx.Value(contextKey(0)).(map[string]interface{})["key"]
+	if found {
+		return k.(string)
+	}
+	return ""
+}
+
+func workCreds(ctx context.Context) (string, string) {
+	var clientID string
+	cid, found := ctx.Value(contextKey(0)).(map[string]interface{})["workClientID"]
+	if found {
+		clientID = cid.(string)
+	}
+
+	var privateKey string
+	pkey, found := ctx.Value(contextKey(0)).(map[string]interface{})["workPrivKey"]
+	if found {
+		privateKey = pkey.(string)
+	}
+	return clientID, privateKey
+}
+
+func httpClient(ctx context.Context) *http.Client {
+	cl, found := ctx.Value(contextKey(0)).(map[string]interface{})["httpClient"]
+	if found && cl != nil {
+		return cl.(*http.Client)
+	}
+	return &http.Client{Transport: &backoff{Transport: http.DefaultTransport}}
+}