API 参考

JavaScript
import SpamScanner from 'spamscanner';             // ESM
const SpamScanner = require('spamscanner');        // CommonJS

const scanner = new SpamScanner(options);
const result = await scanner.scan(rawMessage, scanOptions);

创建一个扫描器并重复使用:它只加载一次模型,并缓存 DNS 和语言模型的回答。

选项#

每个选项都可以传给构造函数。大多数选项也可以针对单封邮件传给 scan(),它们会覆盖合并到构造函数的选项之上。

选项默认值含义
threshold5邮件判为垃圾邮件的分数
rejectThreshold15action 为 reject 的分数
scores{}每项测试的分值:设置键或测试名称(测试与分值)
classifier内置模型Classifier、模型对象、模型文件路径或 false
classifierOptions{}内置模型的选项(见分类器)
allowedLanguages[]ISO 639-1 代码;其他语言会得到 LANGUAGE_NOT_ALLOWED
phishing.cloudflaretrue向 Cloudflare 的过滤解析器查询链接主机
phishing.adulttrue同时查询拦截成人网站的家庭解析器
phishing.maxHosts25每封邮件查询的链接主机数量
phishing.homograph{}brands(替换内置列表)、extraBrands、allowlist(从不标记的域名)、strictMode
dnsbl{ip: [], domain: []}针对客户端 IP 和链接域名的 DNS 黑名单区域
dns{servers: null, timeout: 3000}DNS 检查使用的域名服务器(默认:系统的域名服务器)
attachmentstrue检查附件
macrostrue标记宏、含活动内容的 PDF 和 RTF 对象
arbitrarytrue运行规则
authenticationfalsetrue,或 {dnsServers, timeout, mta, weights}:SPF、DKIM、DMARC、ARC
reputationfalse{allowlist, denylist, apiUrl, headers, timeout}
allowlist、denylistIP 地址、域名或地址;reputation 的简写
clamavfalsetrue(默认套接字)、{socket} 或 {host, port}
llmnull语言模型设置,含 mode、minScore、maxScore
toxicityfalse{model, threshold = 0.7}:一个其 classify([text]) 的回答形式与 @tensorflow-models/toxicity 相同的模型
nsfwfalse{model, threshold = 0.6}:一个其 classify(imageBuffer) 的回答形式与 nsfwjs 相同的模型
maxLength100000读取的正文字符数
timeout10000每项网络检查允许的毫秒数
session{}默认的 SMTP 会话信息

scan() 还接受 session:

JavaScript
await scanner.scan(raw, {
  session: {
    remoteAddress: '203.0.113.5',             // the client's IP address
    resolvedClientHostname: 'mx.example.com', // its verified reverse DNS name
    helo: 'mx.example.com',
    envelope: {
      mailFrom: {address: 'alice@example.com'},
      rcptTo: [{address: 'bob@example.org'}],
    },
  },
});

已经检查过 SPFSender Policy Framework(发件人策略框架):一条 DNS 记录,列出允许代表某个域名发送邮件的服务器。、DKIMDomainKeys Identified Mail(域名密钥识别邮件):对邮件的签名,用发件人在 DNS 中发布的公钥验证。、DMARC一种 DNS 策略,告诉收件服务器:自称来自某个域名的邮件未通过 SPF 和 DKIM 对齐时该如何处理。 和 ARCAuthenticated Received Chain(经认证的接收链):在转发服务器之间传递认证结果的签名。(使用 mailauth)的服务器可以把结果作为 authenticationResults 传入,这些结果会直接计分,不再重新检查:

JavaScript
import {authenticate} from 'mailauth';

const auth = await authenticate(raw, {ip, helo, sender, mta});
await scanner.scan(raw, {authenticationResults: auth});

方法#

方法返回值
scan(source, options)结果。source 为 Buffer、字符串、Uint8Array 或可读流
scanFile(path, options)邮件文件的结果
learn(source, 'spam' | 'ham')用一封邮件训练分类器
unlearn(source, 'spam' | 'ham')撤销 learn
saveModel(path, options)把分类器写入文件(options:minCount、maxFeatures、metadata)
getClassifier()正在使用的 Classifier,或 null
getClassification(features)分类器对 getFeatures 所得特征的判定
getFeatures(mail)邮件的 {features, words, language, script, links, hosts, text, hidden}
getTokens(text, locale)文本中的词语
getTokensAndMailFromSource(source){tokens, features, mail}
parse(source){raw, mail},其中 mail 来自 mailparser

在 getFeatures 中,text 是邮件客户端显示的文本,词语即从中读取;hidden 是 HTML 隐藏的文本字符数。

scanner.metrics 包含 totalScans、averageTime 和 lastScanTime。

结果#

JavaScript
{
  isSpam: true,
  score: 16.25,
  threshold: 5,
  rejectThreshold: 15,
  action: 'reject',                       // 'accept', 'tag' or 'reject'
  message: 'Spam (BAYES_999, PHISHING_LOOKALIKE_DOMAIN, DECEPTIVE_LINK, FROM_NAME_BRAND)',
  tests: [
    {name: 'BAYES_999', score: 6.25, description: 'Classifier spam probability 99.9%'},
    {name: 'PHISHING_LOOKALIKE_DOMAIN', score: 5, description: '"paypa1-secure.top" imitates paypal by swapping characters'},
    // ...
  ],
  results: {
    classification: {probability, category, spam, ham, clues, coverage},
    phishing: [],        // lookalike domains, deceptive links, Cloudflare and URIBL findings
    uncheckedHosts: 0,   // link hosts beyond phishing.maxHosts, not looked up
    attachments: [],     // every attachment finding
    executables: [],     // the executable findings among them
    macros: [],          // macros, active PDFs, RTF objects
    viruses: [],         // ClamAV findings: {filename, virus: [names], message}
    arbitrary: [],       // rules strong enough to mark spam alone
    obfuscation: {invisible, mixed, styled},
    authentication: null, // mailauth's results with a score, when checked
    reputation: null,
    dnsbl: [],           // {zone, value} for each listing
    language: {language, script, notAllowed},
    llm: null,           // the language model's verdict, when asked
    toxicity: [],
    nsfw: [],
    idnHomographAttack: {detected, domains, riskScore},
  },
  links: ['http://paypa1-secure.top/login'],
  language: 'en',
  tokens: ['dear', 'customer', /* ... */],
  mail: {/* the parsed message, from mailparser */},
  version: '7.0.0',
  metrics: {totalTime: 42},
}

phishing、attachments、executables、macros、viruses 和 arbitrary 中的发现都是带有 type 和 message 的对象。String(finding) 即为该消息。

导出#

JavaScript
import SpamScanner, {
  Classifier, getFeatures, segmentWords, detectLanguage,
  LLMClassifier, PROVIDERS, RECOMMENDED_MODELS, CLASSIFIER_MODELS,
  DEFAULT_SCORES, scoreResults, spamHeaders, rewriteMessage,
  loadModel, saveModel, defaultModelPath, loadDefaultModel,
  train, evaluate, readExamples,
  MilterServer, createHttpServer, createTcpServer, createSpamdServer,
  DEFAULTS, VERSION,
} from 'spamscanner';

import ArfParser from 'spamscanner/arf';

Classifier#

JavaScript
const classifier = new Classifier({spamCutoff: 0.99, hamCutoff: 0.2});
classifier.learn(getFeatures(mail).features, 'spam');
classifier.classify(features); // {probability, category, spam, ham, clues, coverage}
选项默认值含义
strength、unknown0.45、0.5Robinson 的 s 和 x:罕见特征被拉向 0.5 的强度
minDistance0.1与 0.5 的距离小于此值的特征会被忽略
maxClues150每封邮件合并的最强特征数量
hamCutoff、spamCutoff0.2、0.99unsure 区间的边界
minLanguageExamples、languageShare1000、0.02某种语言中每类需要多少封邮件才能达到十足的置信度
languagePriortrue用词语所属语言的计数来衡量词语

还可以使用 merge(other)、toJSON(options)、Classifier.fromJSON(json)、size 和 entries()。

训练#

JavaScript
import {train, evaluate, saveModel} from 'spamscanner';

const {classifier, spam, ham} = await train({
  spam: ['/mail/Junk'],
  ham: ['/mail/Archive', '/mail/archive.mbox'],
  datasets: [{file: 'extra.csv', textColumn: 'body', labelColumn: 'kind'}],
});
saveModel(classifier, 'model.json');

evaluate(classifier, examples) 接受 {label, features} 项,或者 readExamples(sources) 的结果(它读取与 train 相同的来源),并返回计数、精确率、召回率、F1、准确率,以及误报率、漏报率和不确定率。

服务器#

JavaScript
import SpamScanner, {MilterServer, createHttpServer, createSpamdServer} from 'spamscanner';

const scanner = new SpamScanner({authentication: true});
const milter = new MilterServer(scanner, {reject: true, rejectCode: 451, subjectTag: '[SPAM]'});
milter.on('scan', ({session, result}) => console.log(session.remoteAddress, result.score));
await milter.listen(7831);

createHttpServer(scanner, {token: process.env.SPAMSCANNER_TOKEN}).listen(7832, '127.0.0.1');
createSpamdServer(scanner).listen(783, '127.0.0.1');

ARF 报告#

spamscanner/arf 读写滥用反馈报告(RFC 5965),这是邮箱服务商用于报告垃圾邮件投诉的格式:

JavaScript
import ArfParser from 'spamscanner/arf';

const report = await ArfParser.parse(rawReport);
console.log(report.feedbackType, report.sourceIp, report.originalHeaders.subject);

const raw = ArfParser.create({
  feedbackType: 'abuse', userAgent: 'MyService/1.0',
  from: 'abuse@example.com', to: 'fbl@example.net',
  originalMessage, sourceIp: '192.0.2.1',
});

ArfParser.tryParse() 对不是报告的邮件返回 null 而不是抛出错误,isArfMessage(mail) 用于检查已解析的邮件。

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