OpenAI-based short link suggestions

openai.go

@@ -0,0 +1,94 @@
+package main
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+)
+
+type oaiClient struct {
+	c      *http.Client
+	apiKey string
+}
+
+type oaiRequest struct {
+	Model    string       `json:"model"`
+	Messages []oaiMessage `json:"messages"`
+}
+
+type oaiMessage struct {
+	Role    string `json:"role"`
+	Content string `json:"content"`
+}
+
+type oaiResponse struct {
+	Choices []oaiChoice `json:"choices"`
+}
+
+type oaiChoice struct {
+	Message oaiMessage `json:"message"`
+}
+
+func newOAIClient(apiKey string) *oaiClient {
+	return &oaiClient{
+		c:      &http.Client{},
+		apiKey: apiKey,
+	}
+}
+
+func newOAIClientFromEnv() (*oaiClient, error) {
+	apiKey := os.Getenv("OPENAI_API_KEY")
+	if apiKey == "" {
+		return nil, fmt.Errorf("OPENAI_API_KEY is not set")
+	}
+
+	return newOAIClient(apiKey), nil
+}
+
+func (oai *oaiClient) completeChat(system, user string) (string, error) {
+	buf := &bytes.Buffer{}
+	err := json.NewEncoder(buf).Encode(&oaiRequest{
+		Model: "gpt-4o",
+		Messages: []oaiMessage{
+			{Role: "system", Content: system},
+			{Role: "user", Content: user},
+		},
+	})
+
+	if err != nil {
+		return "", err
+	}
+
+	req, err := http.NewRequest("POST", "https://api.openai.com/v1/chat/completions", buf)
+	if err != nil {
+		return "", err
+	}
+
+	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", oai.apiKey))
+	req.Header.Set("Content-Type", "application/json")
+
+	resp, err := oai.c.Do(req)
+	if err != nil {
+		return "", err
+	}
+
+	defer resp.Body.Close()
+
+	if resp.StatusCode != 200 {
+		body, _ := io.ReadAll(resp.Body)
+		return "", fmt.Errorf("%s", string(body))
+	}
+
+	dec := json.NewDecoder(resp.Body)
+	var res oaiResponse
+
+	err = dec.Decode(&res)
+	if err != nil {
+		return "", err
+	}
+
+	return res.Choices[0].Message.Content, nil
+}