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package tools
import (
"context"
"encoding/json"
"fmt"
"io"
"net/http"
"net/url"
"regexp"
"strings"
"time"
)
const (
userAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36"
)
type SearchProvider interface {
Search(ctx context.Context, query string, count int) (string, error)
}
type BraveSearchProvider struct {
apiKey string
}
func (p *BraveSearchProvider) Search(ctx context.Context, query string, count int) (string, error) {
searchURL := fmt.Sprintf("https://api.search.brave.com/res/v1/web/search?q=%s&count=%d",
url.QueryEscape(query), count)
req, err := http.NewRequestWithContext(ctx, "GET", searchURL, nil)
if err != nil {
return "", fmt.Errorf("failed to create request: %w", err)
}
req.Header.Set("Accept", "application/json")
req.Header.Set("X-Subscription-Token", p.apiKey)
client := &http.Client{Timeout: 10 * time.Second}
resp, err := client.Do(req)
if err != nil {
return "", fmt.Errorf("request failed: %w", err)
}
defer resp.Body.Close()
body, err := io.ReadAll(resp.Body)
if err != nil {
return "", fmt.Errorf("failed to read response: %w", err)
}
var searchResp struct {
Web struct {
Results []struct {
Title string `json:"title"`
URL string `json:"url"`
Description string `json:"description"`
} `json:"results"`
} `json:"web"`
}
if err := json.Unmarshal(body, &searchResp); err != nil {
// Log error body for debugging
fmt.Printf("Brave API Error Body: %s\n", string(body))
return "", fmt.Errorf("failed to parse response: %w", err)
}
results := searchResp.Web.Results
if len(results) == 0 {
return fmt.Sprintf("No results for: %s", query), nil
}
var lines []string
lines = append(lines, fmt.Sprintf("Results for: %s", query))
for i, item := range results {
if i >= count {
break
}
lines = append(lines, fmt.Sprintf("%d. %s\n %s", i+1, item.Title, item.URL))
if item.Description != "" {
lines = append(lines, fmt.Sprintf(" %s", item.Description))
}
}
return strings.Join(lines, "\n"), nil
}
type DuckDuckGoSearchProvider struct{}
func (p *DuckDuckGoSearchProvider) Search(ctx context.Context, query string, count int) (string, error) {
searchURL := fmt.Sprintf("https://html.duckduckgo.com/html/?q=%s", url.QueryEscape(query))
req, err := http.NewRequestWithContext(ctx, "GET", searchURL, nil)
if err != nil {
return "", fmt.Errorf("failed to create request: %w", err)
}
req.Header.Set("User-Agent", userAgent)
client := &http.Client{Timeout: 10 * time.Second}
resp, err := client.Do(req)
if err != nil {
return "", fmt.Errorf("request failed: %w", err)
}
defer resp.Body.Close()
body, err := io.ReadAll(resp.Body)
if err != nil {
return "", fmt.Errorf("failed to read response: %w", err)
}
return p.extractResults(string(body), count, query)
}
func (p *DuckDuckGoSearchProvider) extractResults(html string, count int, query string) (string, error) {
// Simple regex based extraction for DDG HTML
// Strategy: Find all result containers or key anchors directly
// Try finding the result links directly first, as they are the most critical
// Pattern: <a class="result__a" href="...">Title</a>
// The previous regex was a bit strict. Let's make it more flexible for attributes order/content
reLink := regexp.MustCompile(`<a[^>]*class="[^"]*result__a[^"]*"[^>]*href="([^"]+)"[^>]*>([\s\S]*?)</a>`)
matches := reLink.FindAllStringSubmatch(html, count+5)
if len(matches) == 0 {
return fmt.Sprintf("No results found or extraction failed. Query: %s", query), nil
}
var lines []string
lines = append(lines, fmt.Sprintf("Results for: %s (via DuckDuckGo)", query))
// Pre-compile snippet regex to run inside the loop
// We'll search for snippets relative to the link position or just globally if needed
// But simple global search for snippets might mismatch order.
// Since we only have the raw HTML string, let's just extract snippets globally and assume order matches (risky but simple for regex)
// Or better: Let's assume the snippet follows the link in the HTML
// A better regex approach: iterate through text and find matches in order
// But for now, let's grab all snippets too
reSnippet := regexp.MustCompile(`<a class="result__snippet[^"]*".*?>([\s\S]*?)</a>`)
snippetMatches := reSnippet.FindAllStringSubmatch(html, count+5)
maxItems := min(len(matches), count)
for i := 0; i < maxItems; i++ {
urlStr := matches[i][1]
title := stripTags(matches[i][2])
title = strings.TrimSpace(title)
// URL decoding if needed
if strings.Contains(urlStr, "uddg=") {
if u, err := url.QueryUnescape(urlStr); err == nil {
idx := strings.Index(u, "uddg=")
if idx != -1 {
urlStr = u[idx+5:]
}
}
}
lines = append(lines, fmt.Sprintf("%d. %s\n %s", i+1, title, urlStr))
// Attempt to attach snippet if available and index aligns
if i < len(snippetMatches) {
snippet := stripTags(snippetMatches[i][1])
snippet = strings.TrimSpace(snippet)
if snippet != "" {
lines = append(lines, fmt.Sprintf(" %s", snippet))
}
}
}
return strings.Join(lines, "\n"), nil
}
func stripTags(content string) string {
re := regexp.MustCompile(`<[^>]+>`)
return re.ReplaceAllString(content, "")
}
type WebSearchTool struct {
provider SearchProvider
maxResults int
}
type WebSearchToolOptions struct {
BraveAPIKey string
BraveMaxResults int
BraveEnabled bool
DuckDuckGoMaxResults int
DuckDuckGoEnabled bool
}
func NewWebSearchTool(opts WebSearchToolOptions) *WebSearchTool {
var provider SearchProvider
maxResults := 5
// Priority: Brave > DuckDuckGo
if opts.BraveEnabled && opts.BraveAPIKey != "" {
provider = &BraveSearchProvider{apiKey: opts.BraveAPIKey}
if opts.BraveMaxResults > 0 {
maxResults = opts.BraveMaxResults
}
} else if opts.DuckDuckGoEnabled {
provider = &DuckDuckGoSearchProvider{}
if opts.DuckDuckGoMaxResults > 0 {
maxResults = opts.DuckDuckGoMaxResults
}
} else {
return nil
}
return &WebSearchTool{
provider: provider,
maxResults: maxResults,
}
}
func (t *WebSearchTool) Name() string {
return "web_search"
}
func (t *WebSearchTool) Description() string {
return "Search the web for current information. Returns titles, URLs, and snippets from search results."
}
func (t *WebSearchTool) Parameters() map[string]interface{} {
return map[string]interface{}{
"type": "object",
"properties": map[string]interface{}{
"query": map[string]interface{}{
"type": "string",
"description": "Search query",
},
"count": map[string]interface{}{
"type": "integer",
"description": "Number of results (1-10)",
"minimum": 1.0,
"maximum": 10.0,
},
},
"required": []string{"query"},
}
}
func (t *WebSearchTool) Execute(ctx context.Context, args map[string]interface{}) *ToolResult {
query, ok := args["query"].(string)
if !ok {
return ErrorResult("query is required")
}
count := t.maxResults
if c, ok := args["count"].(float64); ok {
if int(c) > 0 && int(c) <= 10 {
count = int(c)
}
}
result, err := t.provider.Search(ctx, query, count)
if err != nil {
return ErrorResult(fmt.Sprintf("search failed: %v", err))
}
return &ToolResult{
ForLLM: result,
ForUser: result,
}
}
type WebFetchTool struct {
maxChars int
}
func NewWebFetchTool(maxChars int) *WebFetchTool {
if maxChars <= 0 {
maxChars = 50000
}
return &WebFetchTool{
maxChars: maxChars,
}
}
func (t *WebFetchTool) Name() string {
return "web_fetch"
}
func (t *WebFetchTool) Description() string {
return "Fetch a URL and extract readable content (HTML to text). Use this to get weather info, news, articles, or any web content."
}
func (t *WebFetchTool) Parameters() map[string]interface{} {
return map[string]interface{}{
"type": "object",
"properties": map[string]interface{}{
"url": map[string]interface{}{
"type": "string",
"description": "URL to fetch",
},
"maxChars": map[string]interface{}{
"type": "integer",
"description": "Maximum characters to extract",
"minimum": 100.0,
},
},
"required": []string{"url"},
}
}
func (t *WebFetchTool) Execute(ctx context.Context, args map[string]interface{}) *ToolResult {
urlStr, ok := args["url"].(string)
if !ok {
return ErrorResult("url is required")
}
parsedURL, err := url.Parse(urlStr)
if err != nil {
return ErrorResult(fmt.Sprintf("invalid URL: %v", err))
}
if parsedURL.Scheme != "http" && parsedURL.Scheme != "https" {
return ErrorResult("only http/https URLs are allowed")
}
if parsedURL.Host == "" {
return ErrorResult("missing domain in URL")
}
maxChars := t.maxChars
if mc, ok := args["maxChars"].(float64); ok {
if int(mc) > 100 {
maxChars = int(mc)
}
}
req, err := http.NewRequestWithContext(ctx, "GET", urlStr, nil)
if err != nil {
return ErrorResult(fmt.Sprintf("failed to create request: %v", err))
}
req.Header.Set("User-Agent", userAgent)
client := &http.Client{
Timeout: 60 * time.Second,
Transport: &http.Transport{
MaxIdleConns: 10,
IdleConnTimeout: 30 * time.Second,
DisableCompression: false,
TLSHandshakeTimeout: 15 * time.Second,
},
CheckRedirect: func(req *http.Request, via []*http.Request) error {
if len(via) >= 5 {
return fmt.Errorf("stopped after 5 redirects")
}
return nil
},
}
resp, err := client.Do(req)
if err != nil {
return ErrorResult(fmt.Sprintf("request failed: %v", err))
}
defer resp.Body.Close()
body, err := io.ReadAll(resp.Body)
if err != nil {
return ErrorResult(fmt.Sprintf("failed to read response: %v", err))
}
contentType := resp.Header.Get("Content-Type")
var text, extractor string
if strings.Contains(contentType, "application/json") {
var jsonData interface{}
if err := json.Unmarshal(body, &jsonData); err == nil {
formatted, _ := json.MarshalIndent(jsonData, "", " ")
text = string(formatted)
extractor = "json"
} else {
text = string(body)
extractor = "raw"
}
} else if strings.Contains(contentType, "text/html") || len(body) > 0 &&
(strings.HasPrefix(string(body), "<!DOCTYPE") || strings.HasPrefix(strings.ToLower(string(body)), "<html")) {
text = t.extractText(string(body))
extractor = "text"
} else {
text = string(body)
extractor = "raw"
}
truncated := len(text) > maxChars
if truncated {
text = text[:maxChars]
}
result := map[string]interface{}{
"url": urlStr,
"status": resp.StatusCode,
"extractor": extractor,
"truncated": truncated,
"length": len(text),
"text": text,
}
resultJSON, _ := json.MarshalIndent(result, "", " ")
return &ToolResult{
ForLLM: fmt.Sprintf("Fetched %d bytes from %s (extractor: %s, truncated: %v)", len(text), urlStr, extractor, truncated),
ForUser: string(resultJSON),
}
}
func (t *WebFetchTool) extractText(htmlContent string) string {
re := regexp.MustCompile(`<script[\s\S]*?</script>`)
result := re.ReplaceAllLiteralString(htmlContent, "")
re = regexp.MustCompile(`<style[\s\S]*?</style>`)
result = re.ReplaceAllLiteralString(result, "")
re = regexp.MustCompile(`<[^>]+>`)
result = re.ReplaceAllLiteralString(result, "")
result = strings.TrimSpace(result)
re = regexp.MustCompile(`\s+`)
result = re.ReplaceAllLiteralString(result, " ")
lines := strings.Split(result, "\n")
var cleanLines []string
for _, line := range lines {
line = strings.TrimSpace(line)
if line != "" {
cleanLines = append(cleanLines, line)
}
}
return strings.Join(cleanLines, "\n")
}