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qwen/nodejs/node_modules/@sideway/address/lib/email.js

@@ -0,0 +1,170 @@
+'use strict';
+
+const Util = require('util');
+
+const Domain = require('./domain');
+const Errors = require('./errors');
+
+
+const internals = {
+    nonAsciiRx: /[^\x00-\x7f]/,
+    encoder: new (Util.TextEncoder || TextEncoder)()                                            // $lab:coverage:ignore$
+};
+
+
+exports.analyze = function (email, options) {
+
+    return internals.email(email, options);
+};
+
+
+exports.isValid = function (email, options) {
+
+    return !internals.email(email, options);
+};
+
+
+internals.email = function (email, options = {}) {
+
+    if (typeof email !== 'string') {
+        throw new Error('Invalid input: email must be a string');
+    }
+
+    if (!email) {
+        return Errors.code('EMPTY_STRING');
+    }
+
+    // Unicode
+
+    const ascii = !internals.nonAsciiRx.test(email);
+    if (!ascii) {
+        if (options.allowUnicode === false) {                                                   // Defaults to true
+            return Errors.code('FORBIDDEN_UNICODE');
+        }
+
+        email = email.normalize('NFC');
+    }
+
+    // Basic structure
+
+    const parts = email.split('@');
+    if (parts.length !== 2) {
+        return parts.length > 2 ? Errors.code('MULTIPLE_AT_CHAR') : Errors.code('MISSING_AT_CHAR');
+    }
+
+    const [local, domain] = parts;
+
+    if (!local) {
+        return Errors.code('EMPTY_LOCAL');
+    }
+
+    if (!options.ignoreLength) {
+        if (email.length > 254) {                                           // http://tools.ietf.org/html/rfc5321#section-4.5.3.1.3
+            return Errors.code('ADDRESS_TOO_LONG');
+        }
+
+        if (internals.encoder.encode(local).length > 64) {                  // http://tools.ietf.org/html/rfc5321#section-4.5.3.1.1
+            return Errors.code('LOCAL_TOO_LONG');
+        }
+    }
+
+    // Validate parts
+
+    return internals.local(local, ascii) || Domain.analyze(domain, options);
+};
+
+
+internals.local = function (local, ascii) {
+
+    const segments = local.split('.');
+    for (const segment of segments) {
+        if (!segment.length) {
+            return Errors.code('EMPTY_LOCAL_SEGMENT');
+        }
+
+        if (ascii) {
+            if (!internals.atextRx.test(segment)) {
+                return Errors.code('INVALID_LOCAL_CHARS');
+            }
+
+            continue;
+        }
+
+        for (const char of segment) {
+            if (internals.atextRx.test(char)) {
+                continue;
+            }
+
+            const binary = internals.binary(char);
+            if (!internals.atomRx.test(binary)) {
+                return Errors.code('INVALID_LOCAL_CHARS');
+            }
+        }
+    }
+};
+
+
+internals.binary = function (char) {
+
+    return Array.from(internals.encoder.encode(char)).map((v) => String.fromCharCode(v)).join('');
+};
+
+
+/*
+    From RFC 5321:
+
+        Mailbox         =   Local-part "@" ( Domain / address-literal )
+
+        Local-part      =   Dot-string / Quoted-string
+        Dot-string      =   Atom *("."  Atom)
+        Atom            =   1*atext
+        atext           =   ALPHA / DIGIT / "!" / "#" / "$" / "%" / "&" / "'" / "*" / "+" / "-" / "/" / "=" / "?" / "^" / "_" / "`" / "{" / "|" / "}" / "~"
+
+        Domain          =   sub-domain *("." sub-domain)
+        sub-domain      =   Let-dig [Ldh-str]
+        Let-dig         =   ALPHA / DIGIT
+        Ldh-str         =   *( ALPHA / DIGIT / "-" ) Let-dig
+
+        ALPHA           =   %x41-5A / %x61-7A        ; a-z, A-Z
+        DIGIT           =   %x30-39                  ; 0-9
+
+    From RFC 6531:
+
+        sub-domain      =/  U-label
+        atext           =/  UTF8-non-ascii
+
+        UTF8-non-ascii  =   UTF8-2 / UTF8-3 / UTF8-4
+
+        UTF8-2          =   %xC2-DF UTF8-tail
+        UTF8-3          =   %xE0 %xA0-BF UTF8-tail /
+                            %xE1-EC 2( UTF8-tail ) /
+                            %xED %x80-9F UTF8-tail /
+                            %xEE-EF 2( UTF8-tail )
+        UTF8-4          =   %xF0 %x90-BF 2( UTF8-tail ) /
+                            %xF1-F3 3( UTF8-tail ) /
+                            %xF4 %x80-8F 2( UTF8-tail )
+
+        UTF8-tail       =   %x80-BF
+
+    Note: The following are not supported:
+
+        RFC 5321: address-literal, Quoted-string
+        RFC 5322: obs-*, CFWS
+*/
+
+
+internals.atextRx = /^[\w!#\$%&'\*\+\-/=\?\^`\{\|\}~]+$/;               // _ included in \w
+
+
+internals.atomRx = new RegExp([
+
+    //  %xC2-DF UTF8-tail
+    '(?:[\\xc2-\\xdf][\\x80-\\xbf])',
+
+    //  %xE0 %xA0-BF UTF8-tail              %xE1-EC 2( UTF8-tail )            %xED %x80-9F UTF8-tail              %xEE-EF 2( UTF8-tail )
+    '(?:\\xe0[\\xa0-\\xbf][\\x80-\\xbf])|(?:[\\xe1-\\xec][\\x80-\\xbf]{2})|(?:\\xed[\\x80-\\x9f][\\x80-\\xbf])|(?:[\\xee-\\xef][\\x80-\\xbf]{2})',
+
+    //  %xF0 %x90-BF 2( UTF8-tail )            %xF1-F3 3( UTF8-tail )            %xF4 %x80-8F 2( UTF8-tail )
+    '(?:\\xf0[\\x90-\\xbf][\\x80-\\xbf]{2})|(?:[\\xf1-\\xf3][\\x80-\\xbf]{3})|(?:\\xf4[\\x80-\\x8f][\\x80-\\xbf]{2})'
+
+].join('|'));