feat(vanilla): add testing infrastructure and tests (NK-wjnczv)

1 files changed, 588 insertions, 0 deletions

diff --git a/vanilla/node_modules/undici/lib/mock/snapshot-recorder.js b/vanilla/node_modules/undici/lib/mock/snapshot-recorder.js
new file mode 100644
index 0000000..b5d07fa
--- /dev/null
+++ b/vanilla/node_modules/undici/lib/mock/snapshot-recorder.js
@@ -0,0 +1,588 @@
+'use strict'
+
+const { writeFile, readFile, mkdir } = require('node:fs/promises')
+const { dirname, resolve } = require('node:path')
+const { setTimeout, clearTimeout } = require('node:timers')
+const { InvalidArgumentError, UndiciError } = require('../core/errors')
+const { hashId, isUrlExcludedFactory, normalizeHeaders, createHeaderFilters } = require('./snapshot-utils')
+
+/**
+ * @typedef {Object} SnapshotRequestOptions
+ * @property {string} method - HTTP method (e.g. 'GET', 'POST', etc.)
+ * @property {string} path - Request path
+ * @property {string} origin - Request origin (base URL)
+ * @property {import('./snapshot-utils').Headers|import('./snapshot-utils').UndiciHeaders} headers - Request headers
+ * @property {import('./snapshot-utils').NormalizedHeaders} _normalizedHeaders - Request headers as a lowercase object
+ * @property {string|Buffer} [body] - Request body (optional)
+ */
+
+/**
+ * @typedef {Object} SnapshotEntryRequest
+ * @property {string} method - HTTP method (e.g. 'GET', 'POST', etc.)
+ * @property {string} url - Full URL of the request
+ * @property {import('./snapshot-utils').NormalizedHeaders} headers - Normalized headers as a lowercase object
+ * @property {string|Buffer} [body] - Request body (optional)
+ */
+
+/**
+ * @typedef {Object} SnapshotEntryResponse
+ * @property {number} statusCode - HTTP status code of the response
+ * @property {import('./snapshot-utils').NormalizedHeaders} headers - Normalized response headers as a lowercase object
+ * @property {string} body - Response body as a base64url encoded string
+ * @property {Object} [trailers] - Optional response trailers
+ */
+
+/**
+ * @typedef {Object} SnapshotEntry
+ * @property {SnapshotEntryRequest} request - The request object
+ * @property {Array<SnapshotEntryResponse>} responses - Array of response objects
+ * @property {number} callCount - Number of times this snapshot has been called
+ * @property {string} timestamp - ISO timestamp of when the snapshot was created
+ */
+
+/**
+ * @typedef {Object} SnapshotRecorderMatchOptions
+ * @property {Array<string>} [matchHeaders=[]] - Headers to match (empty array means match all headers)
+ * @property {Array<string>} [ignoreHeaders=[]] - Headers to ignore for matching
+ * @property {Array<string>} [excludeHeaders=[]] - Headers to exclude from matching
+ * @property {boolean} [matchBody=true] - Whether to match request body
+ * @property {boolean} [matchQuery=true] - Whether to match query properties
+ * @property {boolean} [caseSensitive=false] - Whether header matching is case-sensitive
+ */
+
+/**
+ * @typedef {Object} SnapshotRecorderOptions
+ * @property {string} [snapshotPath] - Path to save/load snapshots
+ * @property {import('./snapshot-utils').SnapshotMode} [mode='record'] - Mode: 'record' or 'playback'
+ * @property {number} [maxSnapshots=Infinity] - Maximum number of snapshots to keep
+ * @property {boolean} [autoFlush=false] - Whether to automatically flush snapshots to disk
+ * @property {number} [flushInterval=30000] - Auto-flush interval in milliseconds (default: 30 seconds)
+ * @property {Array<string|RegExp>} [excludeUrls=[]] - URLs to exclude from recording
+ * @property {function} [shouldRecord=null] - Function to filter requests for recording
+ * @property {function} [shouldPlayback=null] - Function to filter requests
+ */
+
+/**
+ * @typedef {Object} SnapshotFormattedRequest
+ * @property {string} method - HTTP method (e.g. 'GET', 'POST', etc.)
+ * @property {string} url - Full URL of the request (with query parameters if matchQuery is true)
+ * @property {import('./snapshot-utils').NormalizedHeaders} headers - Normalized headers as a lowercase object
+ * @property {string} body - Request body (optional, only if matchBody is true)
+ */
+
+/**
+ * @typedef {Object} SnapshotInfo
+ * @property {string} hash - Hash key for the snapshot
+ * @property {SnapshotEntryRequest} request - The request object
+ * @property {number} responseCount - Number of responses recorded for this request
+ * @property {number} callCount - Number of times this snapshot has been called
+ * @property {string} timestamp - ISO timestamp of when the snapshot was created
+ */
+
+/**
+ * Formats a request for consistent snapshot storage
+ * Caches normalized headers to avoid repeated processing
+ *
+ * @param {SnapshotRequestOptions} opts - Request options
+ * @param {import('./snapshot-utils').HeaderFilters} headerFilters - Cached header sets for performance
+ * @param {SnapshotRecorderMatchOptions} [matchOptions] - Matching options for headers and body
+ * @returns {SnapshotFormattedRequest} - Formatted request object
+ */
+function formatRequestKey (opts, headerFilters, matchOptions = {}) {
+  const url = new URL(opts.path, opts.origin)
+
+  // Cache normalized headers if not already done
+  const normalized = opts._normalizedHeaders || normalizeHeaders(opts.headers)
+  if (!opts._normalizedHeaders) {
+    opts._normalizedHeaders = normalized
+  }
+
+  return {
+    method: opts.method || 'GET',
+    url: matchOptions.matchQuery !== false ? url.toString() : `${url.origin}${url.pathname}`,
+    headers: filterHeadersForMatching(normalized, headerFilters, matchOptions),
+    body: matchOptions.matchBody !== false && opts.body ? String(opts.body) : ''
+  }
+}
+
+/**
+ * Filters headers based on matching configuration
+ *
+ * @param {import('./snapshot-utils').Headers} headers - Headers to filter
+ * @param {import('./snapshot-utils').HeaderFilters} headerFilters - Cached sets for ignore, exclude, and match headers
+ * @param {SnapshotRecorderMatchOptions} [matchOptions] - Matching options for headers
+ */
+function filterHeadersForMatching (headers, headerFilters, matchOptions = {}) {
+  if (!headers || typeof headers !== 'object') return {}
+
+  const {
+    caseSensitive = false
+  } = matchOptions
+
+  const filtered = {}
+  const { ignore, exclude, match } = headerFilters
+
+  for (const [key, value] of Object.entries(headers)) {
+    const headerKey = caseSensitive ? key : key.toLowerCase()
+
+    // Skip if in exclude list (for security)
+    if (exclude.has(headerKey)) continue
+
+    // Skip if in ignore list (for matching)
+    if (ignore.has(headerKey)) continue
+
+    // If matchHeaders is specified, only include those headers
+    if (match.size !== 0) {
+      if (!match.has(headerKey)) continue
+    }
+
+    filtered[headerKey] = value
+  }
+
+  return filtered
+}
+
+/**
+ * Filters headers for storage (only excludes sensitive headers)
+ *
+ * @param {import('./snapshot-utils').Headers} headers - Headers to filter
+ * @param {import('./snapshot-utils').HeaderFilters} headerFilters - Cached sets for ignore, exclude, and match headers
+ * @param {SnapshotRecorderMatchOptions} [matchOptions] - Matching options for headers
+ */
+function filterHeadersForStorage (headers, headerFilters, matchOptions = {}) {
+  if (!headers || typeof headers !== 'object') return {}
+
+  const {
+    caseSensitive = false
+  } = matchOptions
+
+  const filtered = {}
+  const { exclude: excludeSet } = headerFilters
+
+  for (const [key, value] of Object.entries(headers)) {
+    const headerKey = caseSensitive ? key : key.toLowerCase()
+
+    // Skip if in exclude list (for security)
+    if (excludeSet.has(headerKey)) continue
+
+    filtered[headerKey] = value
+  }
+
+  return filtered
+}
+
+/**
+ * Creates a hash key for request matching
+ * Properly orders headers to avoid conflicts and uses crypto hashing when available
+ *
+ * @param {SnapshotFormattedRequest} formattedRequest - Request object
+ * @returns {string} - Base64url encoded hash of the request
+ */
+function createRequestHash (formattedRequest) {
+  const parts = [
+    formattedRequest.method,
+    formattedRequest.url
+  ]
+
+  // Process headers in a deterministic way to avoid conflicts
+  if (formattedRequest.headers && typeof formattedRequest.headers === 'object') {
+    const headerKeys = Object.keys(formattedRequest.headers).sort()
+    for (const key of headerKeys) {
+      const values = Array.isArray(formattedRequest.headers[key])
+        ? formattedRequest.headers[key]
+        : [formattedRequest.headers[key]]
+
+      // Add header name
+      parts.push(key)
+
+      // Add all values for this header, sorted for consistency
+      for (const value of values.sort()) {
+        parts.push(String(value))
+      }
+    }
+  }
+
+  // Add body
+  parts.push(formattedRequest.body)
+
+  const content = parts.join('|')
+
+  return hashId(content)
+}
+
+class SnapshotRecorder {
+  /** @type {NodeJS.Timeout | null} */
+  #flushTimeout
+
+  /** @type {import('./snapshot-utils').IsUrlExcluded} */
+  #isUrlExcluded
+
+  /** @type {Map<string, SnapshotEntry>} */
+  #snapshots = new Map()
+
+  /** @type {string|undefined} */
+  #snapshotPath
+
+  /** @type {number} */
+  #maxSnapshots = Infinity
+
+  /** @type {boolean} */
+  #autoFlush = false
+
+  /** @type {import('./snapshot-utils').HeaderFilters} */
+  #headerFilters
+
+  /**
+   * Creates a new SnapshotRecorder instance
+   * @param {SnapshotRecorderOptions&SnapshotRecorderMatchOptions} [options={}] - Configuration options for the recorder
+   */
+  constructor (options = {}) {
+    this.#snapshotPath = options.snapshotPath
+    this.#maxSnapshots = options.maxSnapshots || Infinity
+    this.#autoFlush = options.autoFlush || false
+    this.flushInterval = options.flushInterval || 30000 // 30 seconds default
+    this._flushTimer = null
+
+    // Matching configuration
+    /** @type {Required<SnapshotRecorderMatchOptions>} */
+    this.matchOptions = {
+      matchHeaders: options.matchHeaders || [], // empty means match all headers
+      ignoreHeaders: options.ignoreHeaders || [],
+      excludeHeaders: options.excludeHeaders || [],
+      matchBody: options.matchBody !== false, // default: true
+      matchQuery: options.matchQuery !== false, // default: true
+      caseSensitive: options.caseSensitive || false
+    }
+
+    // Cache processed header sets to avoid recreating them on every request
+    this.#headerFilters = createHeaderFilters(this.matchOptions)
+
+    // Request filtering callbacks
+    this.shouldRecord = options.shouldRecord || (() => true) // function(requestOpts) -> boolean
+    this.shouldPlayback = options.shouldPlayback || (() => true) // function(requestOpts) -> boolean
+
+    // URL pattern filtering
+    this.#isUrlExcluded = isUrlExcludedFactory(options.excludeUrls) // Array of regex patterns or strings
+
+    // Start auto-flush timer if enabled
+    if (this.#autoFlush && this.#snapshotPath) {
+      this.#startAutoFlush()
+    }
+  }
+
+  /**
+   * Records a request-response interaction
+   * @param {SnapshotRequestOptions} requestOpts - Request options
+   * @param {SnapshotEntryResponse} response - Response data to record
+   * @return {Promise<void>} - Resolves when the recording is complete
+   */
+  async record (requestOpts, response) {
+    // Check if recording should be filtered out
+    if (!this.shouldRecord(requestOpts)) {
+      return // Skip recording
+    }
+
+    // Check URL exclusion patterns
+    if (this.isUrlExcluded(requestOpts)) {
+      return // Skip recording
+    }
+
+    const request = formatRequestKey(requestOpts, this.#headerFilters, this.matchOptions)
+    const hash = createRequestHash(request)
+
+    // Extract response data - always store body as base64
+    const normalizedHeaders = normalizeHeaders(response.headers)
+
+    /** @type {SnapshotEntryResponse} */
+    const responseData = {
+      statusCode: response.statusCode,
+      headers: filterHeadersForStorage(normalizedHeaders, this.#headerFilters, this.matchOptions),
+      body: Buffer.isBuffer(response.body)
+        ? response.body.toString('base64')
+        : Buffer.from(String(response.body || '')).toString('base64'),
+      trailers: response.trailers
+    }
+
+    // Remove oldest snapshot if we exceed maxSnapshots limit
+    if (this.#snapshots.size >= this.#maxSnapshots && !this.#snapshots.has(hash)) {
+      const oldestKey = this.#snapshots.keys().next().value
+      this.#snapshots.delete(oldestKey)
+    }
+
+    // Support sequential responses - if snapshot exists, add to responses array
+    const existingSnapshot = this.#snapshots.get(hash)
+    if (existingSnapshot && existingSnapshot.responses) {
+      existingSnapshot.responses.push(responseData)
+      existingSnapshot.timestamp = new Date().toISOString()
+    } else {
+      this.#snapshots.set(hash, {
+        request,
+        responses: [responseData], // Always store as array for consistency
+        callCount: 0,
+        timestamp: new Date().toISOString()
+      })
+    }
+
+    // Auto-flush if enabled
+    if (this.#autoFlush && this.#snapshotPath) {
+      this.#scheduleFlush()
+    }
+  }
+
+  /**
+   * Checks if a URL should be excluded from recording/playback
+   * @param {SnapshotRequestOptions} requestOpts - Request options to check
+   * @returns {boolean} - True if URL is excluded
+   */
+  isUrlExcluded (requestOpts) {
+    const url = new URL(requestOpts.path, requestOpts.origin).toString()
+    return this.#isUrlExcluded(url)
+  }
+
+  /**
+   * Finds a matching snapshot for the given request
+   * Returns the appropriate response based on call count for sequential responses
+   *
+   * @param {SnapshotRequestOptions} requestOpts - Request options to match
+   * @returns {SnapshotEntry&Record<'response', SnapshotEntryResponse>|undefined} - Matching snapshot response or undefined if not found
+   */
+  findSnapshot (requestOpts) {
+    // Check if playback should be filtered out
+    if (!this.shouldPlayback(requestOpts)) {
+      return undefined // Skip playback
+    }
+
+    // Check URL exclusion patterns
+    if (this.isUrlExcluded(requestOpts)) {
+      return undefined // Skip playback
+    }
+
+    const request = formatRequestKey(requestOpts, this.#headerFilters, this.matchOptions)
+    const hash = createRequestHash(request)
+    const snapshot = this.#snapshots.get(hash)
+
+    if (!snapshot) return undefined
+
+    // Handle sequential responses
+    const currentCallCount = snapshot.callCount || 0
+    const responseIndex = Math.min(currentCallCount, snapshot.responses.length - 1)
+    snapshot.callCount = currentCallCount + 1
+
+    return {
+      ...snapshot,
+      response: snapshot.responses[responseIndex]
+    }
+  }
+
+  /**
+   * Loads snapshots from file
+   * @param {string} [filePath] - Optional file path to load snapshots from
+   * @return {Promise<void>} - Resolves when snapshots are loaded
+   */
+  async loadSnapshots (filePath) {
+    const path = filePath || this.#snapshotPath
+    if (!path) {
+      throw new InvalidArgumentError('Snapshot path is required')
+    }
+
+    try {
+      const data = await readFile(resolve(path), 'utf8')
+      const parsed = JSON.parse(data)
+
+      // Convert array format back to Map
+      if (Array.isArray(parsed)) {
+        this.#snapshots.clear()
+        for (const { hash, snapshot } of parsed) {
+          this.#snapshots.set(hash, snapshot)
+        }
+      } else {
+        // Legacy object format
+        this.#snapshots = new Map(Object.entries(parsed))
+      }
+    } catch (error) {
+      if (error.code === 'ENOENT') {
+        // File doesn't exist yet - that's ok for recording mode
+        this.#snapshots.clear()
+      } else {
+        throw new UndiciError(`Failed to load snapshots from ${path}`, { cause: error })
+      }
+    }
+  }
+
+  /**
+   * Saves snapshots to file
+   *
+   * @param {string} [filePath] - Optional file path to save snapshots
+   * @returns {Promise<void>} - Resolves when snapshots are saved
+   */
+  async saveSnapshots (filePath) {
+    const path = filePath || this.#snapshotPath
+    if (!path) {
+      throw new InvalidArgumentError('Snapshot path is required')
+    }
+
+    const resolvedPath = resolve(path)
+
+    // Ensure directory exists
+    await mkdir(dirname(resolvedPath), { recursive: true })
+
+    // Convert Map to serializable format
+    const data = Array.from(this.#snapshots.entries()).map(([hash, snapshot]) => ({
+      hash,
+      snapshot
+    }))
+
+    await writeFile(resolvedPath, JSON.stringify(data, null, 2), { flush: true })
+  }
+
+  /**
+   * Clears all recorded snapshots
+   * @returns {void}
+   */
+  clear () {
+    this.#snapshots.clear()
+  }
+
+  /**
+   * Gets all recorded snapshots
+   * @return {Array<SnapshotEntry>} - Array of all recorded snapshots
+   */
+  getSnapshots () {
+    return Array.from(this.#snapshots.values())
+  }
+
+  /**
+   * Gets snapshot count
+   * @return {number} - Number of recorded snapshots
+   */
+  size () {
+    return this.#snapshots.size
+  }
+
+  /**
+   * Resets call counts for all snapshots (useful for test cleanup)
+   * @returns {void}
+   */
+  resetCallCounts () {
+    for (const snapshot of this.#snapshots.values()) {
+      snapshot.callCount = 0
+    }
+  }
+
+  /**
+   * Deletes a specific snapshot by request options
+   * @param {SnapshotRequestOptions} requestOpts - Request options to match
+   * @returns {boolean} - True if snapshot was deleted, false if not found
+   */
+  deleteSnapshot (requestOpts) {
+    const request = formatRequestKey(requestOpts, this.#headerFilters, this.matchOptions)
+    const hash = createRequestHash(request)
+    return this.#snapshots.delete(hash)
+  }
+
+  /**
+   * Gets information about a specific snapshot
+   * @param {SnapshotRequestOptions} requestOpts - Request options to match
+   * @returns {SnapshotInfo|null} - Snapshot information or null if not found
+   */
+  getSnapshotInfo (requestOpts) {
+    const request = formatRequestKey(requestOpts, this.#headerFilters, this.matchOptions)
+    const hash = createRequestHash(request)
+    const snapshot = this.#snapshots.get(hash)
+
+    if (!snapshot) return null
+
+    return {
+      hash,
+      request: snapshot.request,
+      responseCount: snapshot.responses ? snapshot.responses.length : (snapshot.response ? 1 : 0), // .response for legacy snapshots
+      callCount: snapshot.callCount || 0,
+      timestamp: snapshot.timestamp
+    }
+  }
+
+  /**
+   * Replaces all snapshots with new data (full replacement)
+   * @param {Array<{hash: string; snapshot: SnapshotEntry}>|Record<string, SnapshotEntry>} snapshotData - New snapshot data to replace existing ones
+   * @returns {void}
+   */
+  replaceSnapshots (snapshotData) {
+    this.#snapshots.clear()
+
+    if (Array.isArray(snapshotData)) {
+      for (const { hash, snapshot } of snapshotData) {
+        this.#snapshots.set(hash, snapshot)
+      }
+    } else if (snapshotData && typeof snapshotData === 'object') {
+      // Legacy object format
+      this.#snapshots = new Map(Object.entries(snapshotData))
+    }
+  }
+
+  /**
+   * Starts the auto-flush timer
+   * @returns {void}
+   */
+  #startAutoFlush () {
+    return this.#scheduleFlush()
+  }
+
+  /**
+   * Stops the auto-flush timer
+   * @returns {void}
+   */
+  #stopAutoFlush () {
+    if (this.#flushTimeout) {
+      clearTimeout(this.#flushTimeout)
+      // Ensure any pending flush is completed
+      this.saveSnapshots().catch(() => {
+      // Ignore flush errors
+      })
+      this.#flushTimeout = null
+    }
+  }
+
+  /**
+   * Schedules a flush (debounced to avoid excessive writes)
+   */
+  #scheduleFlush () {
+    this.#flushTimeout = setTimeout(() => {
+      this.saveSnapshots().catch(() => {
+        // Ignore flush errors
+      })
+      if (this.#autoFlush) {
+        this.#flushTimeout?.refresh()
+      } else {
+        this.#flushTimeout = null
+      }
+    }, 1000) // 1 second debounce
+  }
+
+  /**
+   * Cleanup method to stop timers
+   * @returns {void}
+   */
+  destroy () {
+    this.#stopAutoFlush()
+    if (this.#flushTimeout) {
+      clearTimeout(this.#flushTimeout)
+      this.#flushTimeout = null
+    }
+  }
+
+  /**
+   * Async close method that saves all recordings and performs cleanup
+   * @returns {Promise<void>}
+   */
+  async close () {
+    // Save any pending recordings if we have a snapshot path
+    if (this.#snapshotPath && this.#snapshots.size !== 0) {
+      await this.saveSnapshots()
+    }
+
+    // Perform cleanup
+    this.destroy()
+  }
+}
+
+module.exports = { SnapshotRecorder, formatRequestKey, createRequestHash, filterHeadersForMatching, filterHeadersForStorage, createHeaderFilters }