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backend/node_modules/@fastify/accept-negotiator/index.js

@@ -0,0 +1,170 @@
+'use strict'
+
+function Negotiator (options) {
+  if (!new.target) {
+    return new Negotiator(options)
+  }
+
+  const {
+    supportedValues = [],
+    cache
+  } = (options && typeof options === 'object' && options) || {}
+
+  this.supportedValues = supportedValues
+
+  this.cache = cache
+}
+
+Negotiator.prototype.negotiate = function (header) {
+  if (typeof header !== 'string') {
+    return null
+  }
+  if (!this.cache) {
+    return negotiate(header, this.supportedValues)
+  }
+  if (!this.cache.has(header)) {
+    this.cache.set(header, negotiate(header, this.supportedValues))
+  }
+  return this.cache.get(header)
+}
+
+function negotiate (header, supportedValues) {
+  if (
+    !header ||
+    !Array.isArray(supportedValues) ||
+    supportedValues.length === 0
+  ) {
+    return null
+  }
+
+  if (header === '*') {
+    return supportedValues[0]
+  }
+
+  let preferredEncoding = null
+  let preferredEncodingPriority = Infinity
+  let preferredEncodingQuality = 0
+
+  function processMatch (enc, quality) {
+    if (quality === 0 || preferredEncodingQuality > quality) {
+      return false
+    }
+
+    const encoding = (enc === '*' && supportedValues[0]) || enc
+    const priority = supportedValues.indexOf(encoding)
+    if (priority === -1) {
+      return false
+    }
+
+    if (priority === 0 && quality === 1) {
+      preferredEncoding = encoding
+      return true
+    } else if (preferredEncodingQuality < quality) {
+      preferredEncoding = encoding
+      preferredEncodingPriority = priority
+      preferredEncodingQuality = quality
+    } else if (preferredEncodingPriority > priority) {
+      preferredEncoding = encoding
+      preferredEncodingPriority = priority
+      preferredEncodingQuality = quality
+    }
+    return false
+  }
+
+  parse(header, processMatch)
+
+  return preferredEncoding
+}
+
+const BEGIN = 0
+const TOKEN = 1
+const QUALITY = 2
+const END = 3
+
+function parse (header, processMatch) {
+  let str = ''
+  let quality
+  let state = BEGIN
+  for (let i = 0, il = header.length; i < il; ++i) {
+    const char = header[i]
+
+    if (char === ' ' || char === '\t') {
+      continue
+    } else if (char === ';') {
+      if (state === TOKEN) {
+        state = QUALITY
+        quality = ''
+      }
+      continue
+    } else if (char === ',') {
+      if (state === TOKEN) {
+        if (processMatch(str, 1)) {
+          state = END
+          break
+        }
+        state = BEGIN
+        str = ''
+      } else if (state === QUALITY) {
+        if (processMatch(str, parseFloat(quality) || 0)) {
+          state = END
+          break
+        }
+        state = BEGIN
+        str = ''
+        quality = ''
+      }
+      continue
+    } else if (
+      state === QUALITY
+    ) {
+      if (char === 'q' || char === '=') {
+        continue
+      } else if (
+        char === '.' ||
+        char === '1' ||
+        char === '0' ||
+        char === '2' ||
+        char === '3' ||
+        char === '4' ||
+        char === '5' ||
+        char === '6' ||
+        char === '7' ||
+        char === '8' ||
+        char === '9'
+      ) {
+        quality += char
+        continue
+      }
+    } else if (state === BEGIN) {
+      state = TOKEN
+      str += char
+      continue
+    }
+    if (state === TOKEN) {
+      const prevChar = header[i - 1]
+      if (prevChar === ' ' || prevChar === '\t') {
+        str = ''
+      }
+      str += char
+      continue
+    }
+    if (processMatch(str, parseFloat(quality) || 0)) {
+      state = END
+      break
+    }
+    state = BEGIN
+    str = char
+    quality = ''
+  }
+
+  if (state === TOKEN) {
+    processMatch(str, 1)
+  } else if (state === QUALITY) {
+    processMatch(str, parseFloat(quality) || 0)
+  }
+}
+
+module.exports = negotiate
+module.exports.default = negotiate
+module.exports.negotiate = negotiate
+module.exports.Negotiator = Negotiator