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website/node_modules/npm/lib/config/set-credentials-by-uri.js

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+var assert = require('assert')
+
+var toNerfDart = require('./nerf-dart.js')
+
+module.exports = setCredentialsByURI
+
+function setCredentialsByURI (uri, c) {
+  assert(uri && typeof uri === 'string', 'registry URL is required')
+  assert(c && typeof c === 'object', 'credentials are required')
+
+  var nerfed = toNerfDart(uri)
+
+  if (c.token) {
+    this.set(nerfed + ':_authToken', c.token, 'user')
+    this.del(nerfed + ':_password', 'user')
+    this.del(nerfed + ':username', 'user')
+    this.del(nerfed + ':email', 'user')
+    this.del(nerfed + ':always-auth', 'user')
+  } else if (c.username || c.password || c.email) {
+    assert(c.username, 'must include username')
+    assert(c.password, 'must include password')
+    assert(c.email, 'must include email address')
+
+    this.del(nerfed + ':_authToken', 'user')
+
+    var encoded = Buffer.from(c.password, 'utf8').toString('base64')
+    this.set(nerfed + ':_password', encoded, 'user')
+    this.set(nerfed + ':username', c.username, 'user')
+    this.set(nerfed + ':email', c.email, 'user')
+
+    if (c.alwaysAuth !== undefined) {
+      this.set(nerfed + ':always-auth', c.alwaysAuth, 'user')
+    } else {
+      this.del(nerfed + ':always-auth', 'user')
+    }
+  } else {
+    throw new Error('No credentials to set.')
+  }
+}