antanst
a8173544e7
- Update common package utilities - Refactor network code for better error handling - Remove deprecated files and functionality - Enhance blacklist and filtering capabilities - Improve snapshot handling and processing
88 lines
2.4 KiB
Go
88 lines
2.4 KiB
Go
package gemini
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import (
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"fmt"
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"net/url"
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"regexp"
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"gemini-grc/common/linkList"
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url2 "gemini-grc/common/url"
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"gemini-grc/logging"
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"gemini-grc/util"
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"git.antanst.com/antanst/xerrors"
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)
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func GetPageLinks(currentURL url2.URL, gemtext string) linkList.LinkList {
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linkLines := util.GetLinesMatchingRegex(gemtext, `(?m)^=>[ \t]+.*`)
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if len(linkLines) == 0 {
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return nil
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}
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var linkURLs linkList.LinkList
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// Normalize URLs in links
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for _, line := range linkLines {
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linkUrl, err := ParseGeminiLinkLine(line, currentURL.String())
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if err != nil {
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logging.LogDebug("error parsing gemini link line: %s", err)
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continue
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}
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linkURLs = append(linkURLs, *linkUrl)
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}
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return linkURLs
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}
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// ParseGeminiLinkLine takes a single link line and the current URL,
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// return the URL converted to an absolute URL
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// and its description.
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func ParseGeminiLinkLine(linkLine string, currentURL string) (*url2.URL, error) {
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// Check: currentURL is parseable
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baseURL, err := url.Parse(currentURL)
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if err != nil {
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return nil, xerrors.NewError(fmt.Errorf("error parsing link line: %w input '%s'", err, linkLine), 0, "", false)
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}
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// Extract the actual URL and the description
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re := regexp.MustCompile(`^=>[ \t]+(\S+)([ \t]+.*)?`)
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matches := re.FindStringSubmatch(linkLine)
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if len(matches) == 0 {
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return nil, xerrors.NewError(fmt.Errorf("error parsing link line: no regexp match for line %s", linkLine), 0, "", false)
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}
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originalURLStr := matches[1]
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// Check: Unescape the URL if escaped
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_, err = url.QueryUnescape(originalURLStr)
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if err != nil {
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return nil, xerrors.NewError(fmt.Errorf("error parsing link line: %w input '%s'", err, linkLine), 0, "", false)
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}
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description := ""
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if len(matches) > 2 {
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description = matches[2]
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}
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// Parse the URL from the link line
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parsedURL, err := url.Parse(originalURLStr)
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if err != nil {
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return nil, xerrors.NewError(fmt.Errorf("error parsing link line: %w input '%s'", err, linkLine), 0, "", false)
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}
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// If link URL is relative, resolve full URL
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if !parsedURL.IsAbs() {
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parsedURL = baseURL.ResolveReference(parsedURL)
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}
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// remove usual first space from URL description:
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// => URL description
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// ^^^^^^^^^^^^
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if len(description) > 0 && description[0] == ' ' {
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description = description[1:]
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}
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finalURL, err := url2.ParseURL(parsedURL.String(), description, true)
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if err != nil {
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return nil, xerrors.NewError(fmt.Errorf("error parsing link line: %w input '%s'", err, linkLine), 0, "", false)
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}
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return finalURL, nil
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}
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