feat: support cloudflare AI Gateway flavored azure openai (#715)

* feat: support cloudflare AI Gateway flavored azure openai

Signed-off-by: STRRL <im@strrl.dev>

* test: add test for cloudflare azure fullURL

---------

Signed-off-by: STRRL <im@strrl.dev>
Co-authored-by: STRRL <im@strrl.dev>

api_internal_test.go

@@ -148,3 +148,39 @@ func TestAzureFullURL(t *testing.T) {
 		})
 	}
 }
+
+func TestCloudflareAzureFullURL(t *testing.T) {
+	cases := []struct {
+		Name    string
+		BaseURL string
+		Expect  string
+	}{
+		{
+			"CloudflareAzureBaseURLWithSlashAutoStrip",
+			"https://gateway.ai.cloudflare.com/v1/dnekeim2i39dmm4mldemakiem3i4mkw3/demo/azure-openai/resource/chatgpt-demo/",
+			"https://gateway.ai.cloudflare.com/v1/dnekeim2i39dmm4mldemakiem3i4mkw3/demo/azure-openai/resource/chatgpt-demo/" +
+				"chat/completions?api-version=2023-05-15",
+		},
+		{
+			"CloudflareAzureBaseURLWithoutSlashOK",
+			"https://gateway.ai.cloudflare.com/v1/dnekeim2i39dmm4mldemakiem3i4mkw3/demo/azure-openai/resource/chatgpt-demo",
+			"https://gateway.ai.cloudflare.com/v1/dnekeim2i39dmm4mldemakiem3i4mkw3/demo/azure-openai/resource/chatgpt-demo/" +
+				"chat/completions?api-version=2023-05-15",
+		},
+	}
+
+	for _, c := range cases {
+		t.Run(c.Name, func(t *testing.T) {
+			az := DefaultAzureConfig("dummy", c.BaseURL)
+			az.APIType = APITypeCloudflareAzure
+
+			cli := NewClientWithConfig(az)
+
+			actual := cli.fullURL("/chat/completions")
+			if actual != c.Expect {
+				t.Errorf("Expected %s, got %s", c.Expect, actual)
+			}
+			t.Logf("Full URL: %s", actual)
+		})
+	}
+}

client.go

@@ -182,7 +182,7 @@ func sendRequestStream[T streamable](client *Client, req *http.Request) (*stream
 func (c *Client) setCommonHeaders(req *http.Request) {
 	// https://learn.microsoft.com/en-us/azure/cognitive-services/openai/reference#authentication
 	// Azure API Key authentication
-	if c.config.APIType == APITypeAzure {
+	if c.config.APIType == APITypeAzure || c.config.APIType == APITypeCloudflareAzure {
 		req.Header.Set(AzureAPIKeyHeader, c.config.authToken)
 	} else if c.config.authToken != "" {
 		// OpenAI or Azure AD authentication
@@ -246,7 +246,13 @@ func (c *Client) fullURL(suffix string, args ...any) string {
 		)
 	}
 
-	// c.config.APIType == APITypeOpenAI || c.config.APIType == ""
+	// https://developers.cloudflare.com/ai-gateway/providers/azureopenai/
+	if c.config.APIType == APITypeCloudflareAzure {
+		baseURL := c.config.BaseURL
+		baseURL = strings.TrimRight(baseURL, "/")
+		return fmt.Sprintf("%s%s?api-version=%s", baseURL, suffix, c.config.APIVersion)
+	}
+
 	return fmt.Sprintf("%s%s", c.config.BaseURL, suffix)
 }
 

config.go

@@ -16,9 +16,10 @@ const (
 type APIType string
 
 const (
-	APITypeOpenAI  APIType = "OPEN_AI"
+	APITypeOpenAI          APIType = "OPEN_AI"
-	APITypeAzure   APIType = "AZURE"
+	APITypeAzure           APIType = "AZURE"
-	APITypeAzureAD APIType = "AZURE_AD"
+	APITypeAzureAD         APIType = "AZURE_AD"
+	APITypeCloudflareAzure APIType = "CLOUDFLARE_AZURE"
 )
 
 const AzureAPIKeyHeader = "api-key"