fun getRedirectedUri()

in facebook-core/src/main/java/com/facebook/internal/UrlRedirectCache.kt [51:111]
51 lines of code
8 McCabe index (conditional complexity)

  fun getRedirectedUri(uri: Uri?): Uri? {
    if (uri == null) {
      return null
    }

    var uriString = uri.toString()
    var reader: InputStreamReader? = null
    val redirectChain = HashSet<String>()
    redirectChain.add(uriString)
    try {
      val cache = getCache()
      var redirectExists = false
      var stream = cache.get(uriString, this.redirectContentTag)

      while (stream != null) {
        redirectExists = true
        // Get the redirected url
        reader = InputStreamReader(stream)
        val buffer = CharArray(128)
        val urlBuilder = StringBuilder()
        var bufferLength = reader.read(buffer, 0, buffer.size)
        while (bufferLength > 0) {
          urlBuilder.append(buffer, 0, bufferLength)
          bufferLength = reader.read(buffer, 0, buffer.size)
        }
        Utility.closeQuietly(reader)

        // Iterate to the next url in the redirection
        val redirectToUriString = urlBuilder.toString()
        if (redirectChain.contains(redirectToUriString)) {
          if (redirectToUriString == uriString) {
            // uriString redirect to itself. Stop the loop
            break
          } else {
            // A loop with more than 1 address is detected. It's unexpected.
            // In this case, return null so that the caller can directly use the original address.
            Logger.log(
                LoggingBehavior.CACHE, Log.ERROR, this.tag, "A loop detected in UrlRedirectCache")
            return null
          }
        }
        uriString = redirectToUriString
        redirectChain.add(uriString)
        stream = cache.get(uriString, this.redirectContentTag)
      }

      if (redirectExists) {
        return Uri.parse(uriString)
      }
    } catch (e: IOException) {
      Logger.log(
          LoggingBehavior.CACHE,
          Log.INFO,
          this.tag,
          "IOException when accessing cache: " + e.message)
    } finally {
      Utility.closeQuietly(reader)
    }

    return null
  }