1 files changed, 37 insertions, 0 deletions
diff --git a/lib/util.js b/lib/util.js
index 2fa5c63..e62bde9 100644
--- a/lib/util.js
+++ b/lib/util.js
@@ -8,6 +8,8 @@ u.ssbRefRegex = /((?:@|%|&|ssb:\/\/%)[A-Za-z0-9\/+]{43}=\.[\w\d]+)/g
 u.ssbRefRegexOnly = /^(?:@|%|&|ssb:\/\/%)[A-Za-z0-9\/+]{43}=\.[\w\d]+$/
 u.ssbRefEncRegex = /((?:ssb:\/\/)?(?:[@%&]|%26|%40|%25)(?:[A-Za-z0-9\/+]|%2[fF]|%2[bB]){43}(?:=|%3[dD])\.[\w\d]+)/g
 u.channelRegex = /^#[^\s#]+$/
+u.ssbURIRegex = /^(ssb:(message|blob|feed)([:\/])([^:?]*?)([:/])([^?]*)(\\?.*)?)$/
+u.gitSsbRepoIdRegex = /^ssb:\/\/(%[A-Za-z0-9\/+]{43}=\.sha256)(\?.*)?$/
 
 u.isRef = function (str) {
   if (!str) return false
@@ -292,3 +294,38 @@ u.extractHostPort = function (id, addr) {
   }
   return addr
 }
+
+u.translateFromGitSsbRepoId = function (url) {
+  var m = u.gitSsbRepoIdRegex.exec(url)
+  if (!m) return
+  var id = m[1]
+  var qs = m[2] || ''
+  return id + qs
+}
+
+u.translateFromURI = function (url) {
+  var m = u.ssbURIRegex.exec(url)
+  if (!m) return u.translateFromGitSsbRepoId(url)
+  var uri = m[1]
+  var prefix = m[2]
+  var separator = m[3]
+  var format = m[4]
+  var separator2 = m[5]
+  var hash = m[6]
+  var qs = m[7] || ''
+  if (separator !== separator2) return
+  hash = b64url.unescape(hash)
+  if (separator === '/') {
+    // ssb-custom-uri
+    try { hash = decodeURIComponent(hash) }
+    catch(e) {}
+  }
+  var sigil
+  switch (prefix) {
+    case 'message': sigil = '%'; break
+    case 'blob': sigil = '&'; break
+    case 'feed': sigil = '@'; break
+    default: return
+  }
+  return sigil + hash + '.' + format + qs
+}