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package ogtags
import (
"errors"
"log/slog"
"net/url"
"syscall"
)
// GetOGTags is the main function that retrieves Open Graph tags for a URL
func (c *OGTagCache) GetOGTags(url *url.URL) (map[string]string, error) {
if url == nil {
return nil, errors.New("nil URL provided, cannot fetch OG tags")
}
urlStr := c.getTarget(url)
// Check cache first
if cachedTags := c.checkCache(urlStr); cachedTags != nil {
return cachedTags, nil
}
// Fetch HTML content
doc, err := c.fetchHTMLDocument(urlStr)
if errors.Is(err, syscall.ECONNREFUSED) {
slog.Debug("Connection refused, returning empty tags")
return nil, nil
} else if errors.Is(err, ErrOgHandled) {
// Error was handled in fetchHTMLDocument, return empty tags
return nil, nil
}
if err != nil {
return nil, err
}
// Extract OG tags
ogTags := c.extractOGTags(doc)
// Store in cache
c.cache.Set(urlStr, ogTags, c.ogTimeToLive)
return ogTags, nil
}
// checkCache checks if we have the tags cached and returns them if so
func (c *OGTagCache) checkCache(urlStr string) map[string]string {
if cachedTags, ok := c.cache.Get(urlStr); ok {
slog.Debug("cache hit", "tags", cachedTags)
return cachedTags
}
slog.Debug("cache miss", "url", urlStr)
return nil
}
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