[bugfix] Fix existing bio text showing as HTML (#531)

* fix existing bio text showing as HTML

- updated replaced mentions to include instance
- strips HTML from account source note in Verify handler
- update text formatter to use buffers for string writes

Signed-off-by: kim <grufwub@gmail.com>

* go away linter

Signed-off-by: kim <grufwub@gmail.com>

* change buf reset location, change html mention tags

Signed-off-by: kim <grufwub@gmail.com>

* reduce FindLinks code complexity

Signed-off-by: kim <grufwub@gmail.com>

* fix HTML to text conversion

Signed-off-by: kim <grufwub@gmail.com>

* Update internal/regexes/regexes.go

Co-authored-by: Mina Galić <mina.galic@puppet.com>

* use improved html2text lib with more options

Signed-off-by: kim <grufwub@gmail.com>

* fix to produce actual plaintext from html

Signed-off-by: kim <grufwub@gmail.com>

* fix span tags instead written as space

Signed-off-by: kim <grufwub@gmail.com>

* performance improvements to regex replacements, fix link replace logic for un-html-ing in the future

Signed-off-by: kim <grufwub@gmail.com>

* fix tag/mention replacements to use input string, fix link replace to not include scheme

Signed-off-by: kim <grufwub@gmail.com>

* use matched input string for link replace href text

Signed-off-by: kim <grufwub@gmail.com>

* remove unused code (to appease linter :sobs:)

Signed-off-by: kim <grufwub@gmail.com>

* improve hashtagFinger regex to be more compliant

Signed-off-by: kim <grufwub@gmail.com>

* update breakReplacer to include both unix and windows line endings

Signed-off-by: kim <grufwub@gmail.com>

* add NoteRaw field to Account to store plaintext account bio, add migration for this, set for sensitive accounts

Signed-off-by: kim <grufwub@gmail.com>

* drop unnecessary code

Signed-off-by: kim <grufwub@gmail.com>

* update text package tests to fix logic changes

Signed-off-by: kim <grufwub@gmail.com>

* add raw note content testing to account update and account verify

Signed-off-by: kim <grufwub@gmail.com>

* remove unused modules

Signed-off-by: kim <grufwub@gmail.com>

* fix emoji regex

Signed-off-by: kim <grufwub@gmail.com>

* fix replacement of hashtags

Signed-off-by: kim <grufwub@gmail.com>

* update code comment

Signed-off-by: kim <grufwub@gmail.com>

Co-authored-by: Mina Galić <mina.galic@puppet.com>

internal/text/link.go

@@ -19,34 +19,28 @@
 package text
 
 import (
+	"bytes"
 	"context"
-	"fmt"
 	"net/url"
+	"strings"
 
-	"mvdan.cc/xurls/v2"
+	"github.com/superseriousbusiness/gotosocial/internal/regexes"
 )
 
-// schemes is the regex for schemes we accept when looking for links.
-// Basically, we accept https or http.
-var schemes = `(((http|https))://)`
-
 // FindLinks parses the given string looking for recognizable URLs (including scheme).
 // It returns a list of those URLs, without changing the string, or an error if something goes wrong.
 // If no URLs are found within the given string, an empty slice and nil will be returned.
-func FindLinks(in string) ([]*url.URL, error) {
-	rxStrict, err := xurls.StrictMatchingScheme(schemes)
-	if err != nil {
-		return nil, err
-	}
-
-	urls := []*url.URL{}
+func FindLinks(in string) []*url.URL {
+	var urls []*url.URL
 
 	// bail already if we don't find anything
-	found := rxStrict.FindAllString(in, -1)
+	found := regexes.LinkScheme.FindAllString(in, -1)
 	if len(found) == 0 {
-		return urls, nil
+		return nil
 	}
 
+	urlmap := map[string]struct{}{}
+
 	// for each string we find, we want to parse it into a URL if we can
 	// if we fail to parse it, just ignore this match and continue
 	for _, f := range found {
@@ -54,29 +48,18 @@ func FindLinks(in string) ([]*url.URL, error) {
 		if err != nil {
 			continue
 		}
-		urls = append(urls, u)
-	}
 
-	// deduplicate the URLs
-	urlsDeduped := []*url.URL{}
+		// Calculate string
+		ustr := u.String()
 
-	for _, u := range urls {
-		if !contains(urlsDeduped, u) {
-			urlsDeduped = append(urlsDeduped, u)
+		if _, ok := urlmap[ustr]; !ok {
+			// Has not been encountered yet
+			urls = append(urls, u)
+			urlmap[ustr] = struct{}{}
 		}
 	}
 
-	return urlsDeduped, nil
-}
-
-// contains checks if the given url is already within a slice of URLs
-func contains(urls []*url.URL, url *url.URL) bool {
-	for _, u := range urls {
-		if u.String() == url.String() {
-			return true
-		}
-	}
-	return false
+	return urls
 }
 
 // ReplaceLinks replaces all detected links in a piece of text with their HTML (href) equivalents.
@@ -84,33 +67,20 @@ func contains(urls []*url.URL, url *url.URL) bool {
 // href will end up double-formatted, if the text you pass here contains one or more hrefs already.
 // To avoid this, you should sanitize any HTML out of text before you pass it into this function.
 func (f *formatter) ReplaceLinks(ctx context.Context, in string) string {
-	rxStrict, err := xurls.StrictMatchingScheme(schemes)
-	if err != nil {
-		panic(err)
-	}
-
-	replaced := rxStrict.ReplaceAllStringFunc(in, func(urlString string) string {
+	return regexes.ReplaceAllStringFunc(regexes.LinkScheme, in, func(urlString string, buf *bytes.Buffer) string {
 		thisURL, err := url.Parse(urlString)
 		if err != nil {
 			return urlString // we can't parse it as a URL so don't replace it
 		}
-
-		shortString := thisURL.Hostname()
-
-		if thisURL.Path != "" {
-			shortString += thisURL.Path
-		}
-
-		if thisURL.Fragment != "" {
-			shortString = shortString + "#" + thisURL.Fragment
-		}
-
-		if thisURL.RawQuery != "" {
-			shortString = shortString + "?" + thisURL.RawQuery
-		}
-
-		replacement := fmt.Sprintf(`<a href="%s" rel="noopener">%s</a>`, urlString, shortString)
-		return replacement
+		// <a href="thisURL.String()" rel="noopener">urlString</a>
+		urlString = thisURL.String()
+		buf.WriteString(`<a href="`)
+		buf.WriteString(thisURL.String())
+		buf.WriteString(`" rel="noopener">`)
+		urlString = strings.TrimPrefix(urlString, thisURL.Scheme)
+		urlString = strings.TrimPrefix(urlString, "://")
+		buf.WriteString(urlString)
+		buf.WriteString(`</a>`)
+		return buf.String()
 	})
-	return replaced
 }