Render account linking page

Simplify account linking data. Change `institution.name` to `institutionName`

Update emailAlreadyLinked value. The layout checks for 'primary' and 'secondary', not a boolean, so update data passed

Add error messages to Account Linking pages

Rename account linking file name to reflect route change. Changed `institution` to `institutional` on the login route.

GitOrigin-RevId: 4e12b9ec7c1577efbaa8c0628e3c41c70114844e

services/web/app/src/Features/Errors/Errors.js

@@ -54,6 +54,15 @@ class NotInV2Error extends BackwardCompatibleError {}
 
 class SLInV2Error extends BackwardCompatibleError {}
 
+class SAMLUserNotFoundError extends BackwardCompatibleError {
+  constructor(arg) {
+    super(arg)
+    if (!this.message) {
+      this.message = 'user not found for SAML provider and external id'
+    }
+  }
+}
+
 class ThirdPartyIdentityExistsError extends BackwardCompatibleError {
   constructor(arg) {
     super(arg)
@@ -99,6 +108,7 @@ module.exports = {
   EmailExistsError,
   InvalidError,
   NotInV2Error,
+  SAMLUserNotFoundError,
   SLInV2Error,
   ThirdPartyIdentityExistsError,
   ThirdPartyUserNotFoundError,

services/web/app/src/Features/User/SAMLIdentityManager.js

@@ -0,0 +1,33 @@
+const Errors = require('../Errors/Errors')
+const { User } = require('../../models/User')
+
+async function getUser(providerId, externalUserId) {
+  if (providerId == null || externalUserId == null) {
+    throw new Error('invalid arguments')
+  }
+  try {
+    const query = SAMLIdentityManager._getUserQuery(providerId, externalUserId)
+    let user = await User.findOne(query).exec()
+    if (!user) {
+      throw new Errors.SAMLUserNotFoundError()
+    }
+    return user
+  } catch (error) {
+    throw error
+  }
+}
+
+const SAMLIdentityManager = {
+  _getUserQuery(providerId, externalUserId) {
+    externalUserId = externalUserId.toString()
+    providerId = providerId.toString()
+    const query = {
+      'samlIdentifiers.externalUserId': externalUserId,
+      'samlIdentifiers.providerId': providerId
+    }
+    return query
+  },
+  getUser
+}
+
+module.exports = SAMLIdentityManager