使用 AWS Amplify 构建 Flutter 移动应用程序 - 第 2 部分

type Trip @model @auth(rules: [{ allow: owner }]) {
  id: ID!
  tripName: String!
  destination: String!
  startDate: AWSDate!
  endDate: AWSDate!
  tripImageUrl: String
  tripImageKey: String
  Activities: [Activity] @hasMany(indexName: "byTrip", fields: ["id"])
}

type Activity @model @auth(rules: [{allow: owner}]) {
  id: ID!
  activityName: String!
  tripID: ID! @index(name: "byTrip", sortKeyFields: ["activityName"])
  trip: Trip! @belongsTo(fields: ["tripID"])
  activityImageUrl: String
  activityImageKey: String
  activityDate: AWSDate!
  activityTime: AWSTime
  category: ActivityCategory!
}



type Profile
  @model
  @auth(
    rules: [
      { allow: private, provider: iam }
      { allow: owner, operations: [read, update, create] }
    ]
  ) {
  id: ID!
  email: String!
  firstName: String
  lastName: String
  homeCity: String
  owner: String! 
}

enum ActivityCategory { Flight, Lodging, Meeting, Restaurant }

amplify codegen models

const { Sha256 } = require("@aws-crypto/sha256-js");
const { defaultProvider } = require("@aws-sdk/credential-provider-node");
const { SignatureV4 } = require("@aws-sdk/signature-v4");
const { HttpRequest } = require("@aws-sdk/protocol-http");
const { default: fetch, Request } = require("node-fetch");

const GRAPHQL_ENDPOINT = process.env.API_AMPLIFYTRIPSPLANNER_GRAPHQLAPIENDPOINTOUTPUT;
const AWS_REGION = process.env.AWS_REGION || 'us-east-1';

const query = /* GraphQL */ `
  mutation createProfile($email: String!,$owner: String!) {
    createProfile(input: {
      email: $email,
      owner: $owner,
      
    }) {
      email
    }
  }
`;




/**
 * @type {import('@types/aws-lambda').PostConfirmationTriggerHandler}
 */
 exports.handler = async (event) => {
  console.log(`EVENT: ${JSON.stringify(event)}`);


  const variables = {
    
      email: event.request.userAttributes.email,
      owner: `${event.request.userAttributes.sub}::${event.userName}`
    
  };






  const endpoint = new URL(GRAPHQL_ENDPOINT);

  const signer = new SignatureV4({
    credentials: defaultProvider(),
    region: AWS_REGION,
    service: 'appsync',
    sha256: Sha256
  });

  const requestToBeSigned = new HttpRequest({
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      host: endpoint.host
    },
    hostname: endpoint.host,
    body: JSON.stringify({ query, variables }),
    path: endpoint.pathname
  });

  const signed = await signer.sign(requestToBeSigned);
  const request = new Request(endpoint, signed);

  let statusCode = 200;
  let body;
  let response;

  try {
    response = await fetch(request);
    body = await response.json();
    if (body.errors) statusCode = 400;
  } catch (error) {
    statusCode = 500;
    body = {
      errors: [
        {
          message: error.message
        }
      ]
    };
  }

  console.log(`statusCode: ${statusCode}`);
  console.log(`body: ${JSON.stringify(body)}`);

  return {
    statusCode,
    body: JSON.stringify(body)
  };
};

amplify update function

? Select the Lambda function you want to update amplifytripsplannere57d0b5cPostConfi
rmation
General information
- Name: amplifytripsplannere57d0b5cPostConfirmation
- Runtime: nodejs

Resource access permission
- Not configured

Scheduled recurring invocation
- Not configured

Lambda layers
- Not configured

Environment variables:
- Not configured

Secrets configuration
- Not configured

? Which setting do you want to update? Resource access permissions
? Select the categories you want this function to have access to. api
? Select the operations you want to permit on amplifytripsplanner Query, Mutation, S
ubscription

You can access the following resource attributes as environment variables from your Lambda function
        API_AMPLIFYTRIPSPLANNER_GRAPHQLAPIENDPOINTOUTPUT
        API_AMPLIFYTRIPSPLANNER_GRAPHQLAPIIDOUTPUT
? Do you want to edit the local lambda function now? No

import 'package:amplify_trips_planner/common/ui/bottomsheet_text_form_field.dart';
import 'package:amplify_trips_planner/features/profile/controller/profile_controller.dart';
import 'package:amplify_trips_planner/models/ModelProvider.dart';
import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:go_router/go_router.dart';

class EditProfileBottomSheet extends ConsumerWidget {
  EditProfileBottomSheet({
    required this.profile,
    super.key,
  });

  final Profile profile;

  final formGlobalKey = GlobalKey<FormState>();

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final firstNameController = TextEditingController(
      text: profile.firstName != null ? profile.firstName! : '',
    );
    final lastNameController = TextEditingController(
      text: profile.lastName != null ? profile.lastName! : '',
    );
    final homeCityController = TextEditingController(
      text: profile.homeCity != null ? profile.homeCity! : '',
    );

    return Form(
      key: formGlobalKey,
      child: Container(
        padding: EdgeInsets.only(
          top: 15,
          left: 15,
          right: 15,
          bottom: MediaQuery.of(context).viewInsets.bottom + 15,
        ),
        width: double.infinity,
        child: Column(
          mainAxisSize: MainAxisSize.min,
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            BottomSheetTextFormField(
              labelText: 'First Name',
              controller: firstNameController,
              keyboardType: TextInputType.name,
            ),
            const SizedBox(
              height: 20,
            ),
            BottomSheetTextFormField(
              labelText: 'Last Name',
              controller: lastNameController,
              keyboardType: TextInputType.name,
            ),
            const SizedBox(
              height: 20,
            ),
            BottomSheetTextFormField(
              labelText: 'Home City',
              controller: homeCityController,
              keyboardType: TextInputType.name,
            ),
            const SizedBox(
              height: 20,
            ),
            TextButton(
              child: const Text('OK'),
              onPressed: () async {
                final currentState = formGlobalKey.currentState;
                if (currentState == null) {
                  return;
                }
                if (currentState.validate()) {
                  final updatedProfile = profile.copyWith(
                    firstName: firstNameController.text,
                    lastName: lastNameController.text,
                    homeCity: homeCityController.text,
                  );
                  await ref
                      .watch(profileControllerProvider.notifier)
                      .updateProfile(updatedProfile);

                  if (context.mounted) {
                    context.pop();
                  }
                }
              }, //,
            ),
          ],
        ),
      ),
    );
  }
}

import 'package:amplify_trips_planner/common/utils/colors.dart' as constants;
import 'package:amplify_trips_planner/features/profile/controller/profile_controller.dart';
import 'package:amplify_trips_planner/features/profile/ui/profile_page/edit_profile_bottomsheet.dart';
import 'package:amplify_trips_planner/models/ModelProvider.dart';
import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';

class ProfileListView extends ConsumerWidget {
  const ProfileListView({
    required this.profile,
    super.key,
  });

  final AsyncValue<Profile> profile;

  void editProfile(BuildContext context, Profile profile) async {
    await showModalBottomSheet<void>(
      isScrollControlled: true,
      elevation: 5,
      context: context,
      builder: (BuildContext context) {
        return EditProfileBottomSheet(
          profile: profile,
        );
      },
    );
  }

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    switch (profile) {
      case AsyncData(:final value):
        return ListView(
          children: [
            Card(
              child: ListTile(
                leading: const Icon(
                  Icons.verified_user,
                  size: 50,
                  color: Color(constants.primaryColorDark),
                ),
                title: Text(
                  value.firstName != null ? value.firstName! : 'Add your name',
                  style: Theme.of(context).textTheme.titleLarge,
                ),
                subtitle: Text(value.email),
              ),
            ),
            ListTile(
              dense: true,
              title: Text(
                'Home',
                style: Theme.of(context)
                    .textTheme
                    .titleSmall!
                    .copyWith(color: Colors.white),
              ),
              tileColor: Colors.grey,
            ),
            Card(
              child: ListTile(
                title: Text(
                  value.firstName != null ? value.homeCity! : 'Add your city',
                  style: Theme.of(context).textTheme.titleLarge,
                ),
              ),
            ),
            const ListTile(
              dense: true,
              tileColor: Colors.grey,
              visualDensity: VisualDensity(vertical: -4),
            ),
            Card(
              child: Row(
                mainAxisAlignment: MainAxisAlignment.spaceAround,
                children: [
                  TextButton(
                    style: TextButton.styleFrom(
                      textStyle: const TextStyle(fontSize: 20),
                    ),
                    onPressed: () {
                      editProfile(context, value);
                    },
                    child: const Text('Edit'),
                  ),
                ],
              ),
            )
          ],
        );

      case AsyncError():
        return Column(
          mainAxisSize: MainAxisSize.min,
          crossAxisAlignment: CrossAxisAlignment.center,
          children: [
            Padding(
              padding: const EdgeInsets.all(8),
              child: Text(
                'Error',
                style: Theme.of(context).textTheme.titleMedium,
                textAlign: TextAlign.center,
              ),
            ),
            TextButton(
              style: TextButton.styleFrom(
                textStyle: const TextStyle(fontSize: 20),
              ),
              onPressed: () async {
                ref.invalidate(profileControllerProvider);
              },
              child: const Text('Try again'),
            ),
          ],
        );
      case AsyncLoading():
        return const Center(
          child: CircularProgressIndicator(),
        );

      case _:
        return const Center(
          child: Text('Error'),
        );
    }
  }
}

import 'package:amplify_trips_planner/common/ui/the_navigation_drawer.dart';
import 'package:amplify_trips_planner/common/utils/colors.dart' as constants;
import 'package:amplify_trips_planner/features/profile/controller/profile_controller.dart';
import 'package:amplify_trips_planner/features/profile/ui/profile_page/profile_listview.dart';
import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';

class ProfilePage extends ConsumerWidget {
  const ProfilePage({
    super.key,
  });

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final profileValue = ref.watch(profileControllerProvider);
    return Scaffold(
      appBar: AppBar(
        centerTitle: true,
        title: const Text(
          'Amplify Trips Planner',
        ),
        backgroundColor: const Color(constants.primaryColorDark),
      ),
      drawer: const TheNavigationDrawer(),
      body: ProfileListView(
        profile: profileValue,
      ),
    );
  }
}