1 00:00:07,630 --> 00:00:12,270 Hey hey everybody what's going on this is Caleb with Dev's Lopes dot com. 2 00:00:12,310 --> 00:00:17,620 And in this video we're going to set up our authentication service which includes two very critical 3 00:00:17,620 --> 00:00:21,220 functions register user and log in user. 4 00:00:21,280 --> 00:00:26,760 These both are going to be what allow us to actually authenticate users add users to our app. 5 00:00:26,890 --> 00:00:30,700 And also it's going to allow us to check to see whether they're logged in or not which is going to be 6 00:00:30,700 --> 00:00:36,490 really important for just monitoring just the authentication status of our app. 7 00:00:36,490 --> 00:00:36,790 All right. 8 00:00:36,790 --> 00:00:42,520 So go ahead and pull open that X code project and we're going to go ahead and create a new file in our 9 00:00:42,520 --> 00:00:46,210 services group called Auth. service. 10 00:00:46,330 --> 00:00:49,270 Right click on services click new file. 11 00:00:49,420 --> 00:00:55,650 And what we're going to do is create a new Swift file doesn't need to subclass anything but we're going 12 00:00:55,650 --> 00:00:58,390 to go ahead and call this off service. 13 00:00:58,570 --> 00:01:04,090 And this is of course just like the data service going to be a singleton class where we're going to 14 00:01:04,090 --> 00:01:10,120 instantiate an instance of this class inside itself which gives us access to it throughout the entire 15 00:01:10,120 --> 00:01:12,310 lifecycle of our app from any class. 16 00:01:12,310 --> 00:01:18,520 It's very cool and very helpful but we're also being careful not to abuse the singleton pattern because 17 00:01:18,520 --> 00:01:23,290 it's very easy to do that and we don't want to do that because we want to use this how we need it and 18 00:01:23,290 --> 00:01:23,910 that's all. 19 00:01:24,070 --> 00:01:29,440 So let's go ahead and let's begin actually by importing firebase because we're going to need that to 20 00:01:29,440 --> 00:01:30,930 authenticate users. 21 00:01:31,210 --> 00:01:32,500 And I don't want to forget. 22 00:01:32,510 --> 00:01:38,520 So let's go ahead create the class and call it author service. 23 00:01:39,550 --> 00:01:43,200 Then we're going to create a static constant called instance. 24 00:01:43,210 --> 00:01:49,920 And the reason we're creating a static instance is because it allows the static variable to be alive 25 00:01:49,990 --> 00:01:54,880 for the entire lifecycle of the app so as long as the app is running you have access to that instance 26 00:01:54,970 --> 00:01:55,940 of this class. 27 00:01:56,110 --> 00:02:04,000 So go ahead and type static let instance equals auth service put parentheses at the end to instantiate 28 00:02:04,000 --> 00:02:04,570 it. 29 00:02:04,690 --> 00:02:11,450 And we're going to create two functions like I said one is phunk register user. 30 00:02:11,590 --> 00:02:15,290 The other is phunk log in user. 31 00:02:15,640 --> 00:02:20,890 And are apps going to be pretty interesting because if a user has not yet registered they're going to 32 00:02:20,890 --> 00:02:26,170 be able to put in their email and password and click sign in if they're not registered it will register 33 00:02:26,170 --> 00:02:31,030 them then log them in if they are registered it will just log them in and it's pretty cool. 34 00:02:31,030 --> 00:02:35,900 Kind of adds to the user experience it makes it very simple to get into our app and start using it. 35 00:02:35,950 --> 00:02:42,190 Now there are some important things that we actually need to know and actually need to do in order to 36 00:02:42,190 --> 00:02:44,590 register a user successfully. 37 00:02:44,590 --> 00:02:45,570 Now what we need. 38 00:02:45,640 --> 00:02:46,620 We need their email. 39 00:02:46,630 --> 00:02:47,760 We need their password. 40 00:02:47,770 --> 00:02:51,160 And we also need to know when registration is done. 41 00:02:51,160 --> 00:02:57,820 Because like I said when it's done we should be able to call our log in function to log them in automatically. 42 00:02:57,820 --> 00:03:00,430 So go ahead and we're going to type with e-mail. 43 00:03:00,550 --> 00:03:06,150 So register user with e-mail or use an internal parameter here called e-mail. 44 00:03:06,220 --> 00:03:12,190 Next I'm going to say and password internal parameter called password that's just something I like to 45 00:03:12,190 --> 00:03:18,040 do because if I was to just say and password I would have to use that and password name in here. 46 00:03:18,060 --> 00:03:22,580 But really I'm just talking about the password not an and password or with e-mail. 47 00:03:22,630 --> 00:03:27,970 So internal parameters are kind of cool because they let you set the actual name of what your what kind 48 00:03:27,970 --> 00:03:29,710 of information you're dealing with. 49 00:03:29,710 --> 00:03:32,400 So registry user with email and password. 50 00:03:32,680 --> 00:03:38,790 And we're going to go ahead and also create a completion handler using an escaping closure. 51 00:03:38,800 --> 00:03:47,200 So go ahead and type user creation complete and that's going to be escaping Like I said so that values 52 00:03:47,200 --> 00:03:54,370 can be taken out like in this case we want to be able to send an error to an air handler just in case 53 00:03:54,370 --> 00:04:00,870 there's a problem and we're going to create a function here and we're going to return an empty function. 54 00:04:00,870 --> 00:04:03,400 K that means we're returning nothing because we don't need to. 55 00:04:03,400 --> 00:04:05,390 But we do need to pass values out. 56 00:04:05,410 --> 00:04:11,580 So in order to do that we're going to do underscore status is of type bool meaning. 57 00:04:11,830 --> 00:04:18,490 Is it complete or is it not complete then we're going to go ahead and we're going to return or pass 58 00:04:18,520 --> 00:04:20,260 an error if there is one. 59 00:04:20,350 --> 00:04:21,800 But sometimes there's not. 60 00:04:21,850 --> 00:04:27,520 So we're going to set error to actually be optional meaning we can pass nil here and it's OK it's not 61 00:04:27,520 --> 00:04:30,540 going to crash our app because it can accept nil. 62 00:04:30,640 --> 00:04:33,660 So very cool once or user creation is complete. 63 00:04:33,670 --> 00:04:34,360 We're going to pass. 64 00:04:34,360 --> 00:04:35,150 True. 65 00:04:35,500 --> 00:04:40,690 If there's an error and it's not we're going to pass false if we get an error from our account creation 66 00:04:40,690 --> 00:04:46,960 like maybe it notices it's not a real email there's no sign there's no dot com dot org we'll send an 67 00:04:47,020 --> 00:04:49,040 error through and we'll print that. 68 00:04:49,150 --> 00:04:49,870 OK. 69 00:04:50,080 --> 00:04:56,740 So that's our function for registry user logon user is actually going to be basically identical because 70 00:04:56,740 --> 00:05:02,370 to log in a user We need an email we need a password and we need to know when it's done. 71 00:05:02,380 --> 00:05:03,780 So I'm going to actually copy this. 72 00:05:03,790 --> 00:05:09,610 I'm being a bad coder but I'm going to paste it in and instead of saying user creation complete Let's 73 00:05:09,610 --> 00:05:11,790 just say log in complete. 74 00:05:12,330 --> 00:05:13,280 OK. 75 00:05:13,570 --> 00:05:14,140 Very cool. 76 00:05:14,140 --> 00:05:16,330 And we'll come back to log in user in a second. 77 00:05:16,330 --> 00:05:21,050 But for now let's go into register user and let's think about what we need to do. 78 00:05:21,220 --> 00:05:26,920 We need to pass in the email and password and we need to use firebase in order to actually register 79 00:05:26,920 --> 00:05:29,010 a user into our database. 80 00:05:29,230 --> 00:05:33,890 So to do that we're going to use some of the nice built in functions from firebase. 81 00:05:34,000 --> 00:05:42,840 So go ahead and type off dot off and there's a function in here called create user with e-mail password 82 00:05:43,210 --> 00:05:45,540 and it has a completion handler which is pretty cool. 83 00:05:45,550 --> 00:05:51,310 So let's go ahead and let's give it the e-mail that we passed in from our function give it the password 84 00:05:51,640 --> 00:05:53,540 that we passed in from our password. 85 00:05:53,710 --> 00:05:58,120 And for the result call that press enter and you'll see there are two things. 86 00:05:58,120 --> 00:06:02,800 Given user and error go ahead and name them user and error. 87 00:06:02,800 --> 00:06:05,050 And those are the things that are passed back. 88 00:06:05,050 --> 00:06:08,620 So as you can see they're optional meaning sometimes there might not be a user. 89 00:06:08,650 --> 00:06:12,730 If there's not then it'll probably throw an error saying this user doesn't exist. 90 00:06:12,760 --> 00:06:18,260 So let's just call it user and error as constants to hold those values. 91 00:06:18,310 --> 00:06:24,460 Now what we need to do is if a user is returned we're going to create a constant to hold all of the 92 00:06:24,460 --> 00:06:26,480 information for that user. 93 00:06:26,560 --> 00:06:31,120 If there is not a user We're going to basically handle any errors that come back. 94 00:06:31,120 --> 00:06:36,400 So we're going to use guard less so that we can safely create a user if there is one returned. 95 00:06:36,410 --> 00:06:39,340 But if there is not then we're going to handle the error. 96 00:06:39,340 --> 00:06:46,530 So go ahead and type guard let user equals user user. 97 00:06:46,600 --> 00:06:50,510 That means if a user has returned we will do that else. 98 00:06:50,950 --> 00:06:56,700 And I'm actually going to go ahead and inside the brackets here I'm going to handle the error. 99 00:06:56,740 --> 00:07:00,470 So go ahead and type user creation complete. 100 00:07:00,730 --> 00:07:03,270 And this is where we can pass in false. 101 00:07:03,280 --> 00:07:07,770 The user was not created and the error is going to be the error. 102 00:07:07,780 --> 00:07:09,820 We're going to pass the era back to our handlers. 103 00:07:09,820 --> 00:07:11,310 We can use it later on. 104 00:07:11,530 --> 00:07:13,240 That's pretty cool. 105 00:07:13,240 --> 00:07:16,270 Now what we're going to do is we're going to just leave it at that. 106 00:07:16,300 --> 00:07:18,790 And that is what we will do if there is an error. 107 00:07:18,790 --> 00:07:23,800 We're going to say false the user creation was not complete and there was an error. 108 00:07:23,800 --> 00:07:26,030 Ok but what if there was no error. 109 00:07:26,110 --> 00:07:26,900 We get through. 110 00:07:26,920 --> 00:07:29,050 We have a value in user. 111 00:07:29,050 --> 00:07:31,600 We should create an account for that user. 112 00:07:31,600 --> 00:07:39,730 So if you remember in our data service let's call data service for instance create DB user We need a 113 00:07:39,790 --> 00:07:41,050 unique ID. 114 00:07:41,040 --> 00:07:44,790 Whoops we need a unique ID and a user dictionary. 115 00:07:44,800 --> 00:07:47,090 Thats where all the data gets passed to firebase. 116 00:07:47,110 --> 00:07:52,570 So in order to actually pass that we need to create a user data dictionary. 117 00:07:52,570 --> 00:07:54,620 So lets go ahead and do that by typing. 118 00:07:54,640 --> 00:08:02,560 Let user data and thats going to be equal to a dictionary and for the first key value pair were going 119 00:08:02,560 --> 00:08:06,000 to go ahead and just call provider. 120 00:08:06,010 --> 00:08:10,800 Now if you dive deeply into firebase you will see there are different providers. 121 00:08:10,810 --> 00:08:12,050 One is Facebook. 122 00:08:12,100 --> 00:08:15,070 One is Google one is firebase one is e-mail. 123 00:08:15,160 --> 00:08:17,810 Now we're going to be creating an email user. 124 00:08:18,010 --> 00:08:23,200 So our firebase provider is just going to be pulled from user. 125 00:08:23,260 --> 00:08:25,030 Assuming the user comes through. 126 00:08:25,240 --> 00:08:31,570 And if you put a period there you can see that there is a provider ID and thats the information that 127 00:08:31,570 --> 00:08:32,660 comes through to us. 128 00:08:32,770 --> 00:08:37,970 A provider ID can be firebase email Facebook Google et cetera. 129 00:08:38,470 --> 00:08:42,230 Next we're going to go ahead and we're going to send up the e-mail from the user. 130 00:08:42,340 --> 00:08:50,010 So let's give it a key of e-mail and the value is going to be user e-mail. 131 00:08:50,380 --> 00:08:51,070 OK. 132 00:08:51,370 --> 00:08:54,490 If there's a user We're going to get its e-mail and that's awesome. 133 00:08:54,490 --> 00:08:57,000 We now have a dictionary of user data. 134 00:08:57,160 --> 00:08:58,480 Very very cool. 135 00:08:58,570 --> 00:09:04,750 Now to create the database user we need to pass a unique ID but you know what the cool thing is it already 136 00:09:04,750 --> 00:09:05,740 has one. 137 00:09:05,740 --> 00:09:11,950 Let's go ahead and type user you I.D. the user already has a unique ID that it's given. 138 00:09:11,950 --> 00:09:12,880 So that's really easy. 139 00:09:12,880 --> 00:09:13,960 We don't have to generate it. 140 00:09:13,960 --> 00:09:17,380 We don't have to write a function that can generate a random number that's different than all the other 141 00:09:17,380 --> 00:09:18,190 numbers. 142 00:09:18,190 --> 00:09:24,840 We can just pull the ID from firebase so so helpful for user data of course we just created that dictionary 143 00:09:24,850 --> 00:09:31,120 so let's pass it user data and you know what when we call this if everything is here that means that 144 00:09:31,120 --> 00:09:35,590 our user will actually be sent up to firebase will have a user in our database. 145 00:09:35,590 --> 00:09:37,090 Very very cool. 146 00:09:37,090 --> 00:09:43,590 So what we do need to do actually sorry is we need to return. 147 00:09:44,350 --> 00:09:45,600 And that's part of guard let. 148 00:09:45,610 --> 00:09:46,740 I forgot about that. 149 00:09:46,800 --> 00:09:49,170 If if there is a problem. 150 00:09:49,270 --> 00:09:55,180 OK we will pass false to our call completion handler will handle the error and then we're going to go 151 00:09:55,180 --> 00:09:57,160 ahead and return out of it. 152 00:09:57,170 --> 00:09:59,220 OK but if it works then we'll have a value. 153 00:09:59,230 --> 00:10:05,590 We can create this dictionary create the database user then at the end we can go ahead and call user 154 00:10:05,590 --> 00:10:12,930 completion or use creation complete and we can pass in true and we can pass in nil because there will 155 00:10:12,930 --> 00:10:14,130 be no errors. 156 00:10:14,130 --> 00:10:14,910 Very very cool. 157 00:10:14,910 --> 00:10:16,890 So that's how we're going to register a user. 158 00:10:16,890 --> 00:10:21,850 We're going to pass up the data to firebase If an email and password come in. 159 00:10:22,110 --> 00:10:28,590 And if there is a problem right if maybe it's not a real email or maybe if the password is not enough 160 00:10:28,590 --> 00:10:32,790 characters which will set that up later on it will pass us an error. 161 00:10:32,790 --> 00:10:33,150 All right. 162 00:10:33,150 --> 00:10:34,200 Very cool. 163 00:10:34,200 --> 00:10:39,480 Next up let's go ahead and let's log in the user and we're going to do it pretty much the same way just 164 00:10:39,480 --> 00:10:43,660 with a different function from firebase So go ahead and call off. 165 00:10:43,820 --> 00:10:49,630 Off the dot log in user sign in with e-mail. 166 00:10:49,760 --> 00:10:52,010 OK you'll see it's down there it's like the fifth option. 167 00:10:53,550 --> 00:11:00,090 Very cool and for the e-mail of course we'll pass an email for the password will pass in the password 168 00:11:00,240 --> 00:11:06,620 and remember email and password from our function and the completion press Enter just like above. 169 00:11:06,720 --> 00:11:12,410 If we attempt to sign in we should get a user back if we have a problem. 170 00:11:12,410 --> 00:11:12,950 Whoops. 171 00:11:13,170 --> 00:11:16,410 If we have a problem we'll get an error back. 172 00:11:16,410 --> 00:11:17,570 Simple as that. 173 00:11:17,790 --> 00:11:22,010 And what we're going to do is we're going to handle what happens if we get a user so go ahead and type 174 00:11:22,020 --> 00:11:22,550 guard. 175 00:11:22,590 --> 00:11:26,060 Just like above user equals user. 176 00:11:26,490 --> 00:11:33,930 Else if we don't write if there if we don't get a successful user back go ahead and call log incompletion 177 00:11:34,110 --> 00:11:36,240 or log complete is false. 178 00:11:36,240 --> 00:11:40,100 We didn't log in and we had an error and we're going to pass it. 179 00:11:40,110 --> 00:11:42,580 That error that we get from our closure here. 180 00:11:42,590 --> 00:11:42,950 OK. 181 00:11:42,990 --> 00:11:44,420 That's pretty cool. 182 00:11:44,430 --> 00:11:46,850 Now of course at the end we need to return. 183 00:11:46,860 --> 00:11:51,360 We just need to get out of this function if we don't successfully get a user. 184 00:11:51,630 --> 00:11:59,070 So if we do get a value back for user all we need to do is just type log in complete and go ahead and 185 00:11:59,520 --> 00:12:04,920 give it a true for its Boullion and for the error we can just say nil because there was no problem. 186 00:12:04,920 --> 00:12:06,080 Very very cool. 187 00:12:06,270 --> 00:12:12,760 And sign in will happen on its own when it's done you'll know that it has been successfully authenticated. 188 00:12:12,810 --> 00:12:19,320 We have successfully logged in and this is it guys we have now set up the functions to register a user 189 00:12:19,710 --> 00:12:21,240 and to log any user. 190 00:12:21,300 --> 00:12:22,600 Pretty pretty cool. 191 00:12:22,710 --> 00:12:28,980 In the next video we're going to actually set up so that our log in VC is presented from our app delegate 192 00:12:29,220 --> 00:12:31,410 that will be monitoring our authentication status. 193 00:12:31,410 --> 00:12:36,130 And as soon as we log out it's going to present that log in B.C. automatically for us. 194 00:12:36,210 --> 00:12:43,110 We're going to also set up how we can present off AVC from the log in VC and we're also going to set 195 00:12:43,110 --> 00:12:46,220 up Visi so that we can log in with our e-mail. 196 00:12:46,230 --> 00:12:47,280 That's super super cool. 197 00:12:47,280 --> 00:12:51,870 We're going to actually allow it to authenticate us and log us into firebase So we'll see in the next 198 00:12:51,870 --> 00:12:52,380 video. 199 00:12:52,380 --> 00:12:53,920 Awesome job with this one let's head over there.