WEBVTT 00:00.170 --> 00:06.860 So we have almost reached the end of this project and this video is optional. 00:06.890 --> 00:13.790 But before you decide if you want to watch it or not, let me explain what it is about. 00:13.790 --> 00:22.700 So we are at the guestbook page and you can see I am displaying the names and emails in the open. 00:22.730 --> 00:23.870 That's not good. 00:23.900 --> 00:33.080 We don't want the emails that people have sent to us to be picked up by any robots, or any automated 00:33.080 --> 00:37.970 bots that can use those emails to spam those people. 00:38.000 --> 00:43.340 And in this video, we will obfuscate this data inside the view. 00:43.370 --> 00:50.540 So that's why I say this is optional, but it might be an interesting exercise on how do you work with 00:50.540 --> 00:51.380 strings. 00:51.380 --> 00:55.280 So either stay or you can skip this one. 00:56.000 --> 00:57.740 Now I think you are staying. 00:57.740 --> 01:02.430 So let's jump to the guestbook router. 01:03.330 --> 01:06.900 So we're not gonna be doing anything in here. 01:06.900 --> 01:12.270 I think we can actually add some view logic. 01:13.110 --> 01:20.940 So in here with the messages I'm going to add some functions that will obfuscate the email and the name. 01:20.940 --> 01:27.120 And we're just going to use those functions every single time we render something. 01:27.930 --> 01:30.420 By the way let's have the docs open. 01:30.420 --> 01:33.960 And let's begin by obfuscating the name. 01:33.960 --> 01:38.730 Let me add a function called obfuscate name. 01:38.730 --> 01:45.480 I'm starting with this one because it's just would be easier to return a string from it. 01:47.190 --> 01:54.090 So we need to use the str Len which is checking the length of a string. 01:54.090 --> 01:57.790 If this is less or equal to. 01:57.820 --> 02:03.070 Then you shouldn't really obfuscate anything as there is no point. 02:03.220 --> 02:06.490 I think there are some names that are this short. 02:06.520 --> 02:14.620 It might be a nickname, or I think some Asian names are this short now. 02:15.130 --> 02:20.320 In the other case, first we're gonna just get the first letter of the name. 02:20.320 --> 02:26.650 For that, we're gonna use another function called substring, which basically lets us get the part 02:26.680 --> 02:27.700 of a string. 02:28.690 --> 02:33.670 So from name we are starting at an offset which is zero based. 02:34.240 --> 02:40.360 So I get the position zero which is the first letter and the length is one. 02:40.600 --> 02:47.560 Then I'm gonna generate some characters using str repeat. 02:47.560 --> 02:54.370 This allows me to construct a string from a character or from a string in general. 02:55.940 --> 02:59.870 So first a string to repeat that would be an asterisk. 03:00.500 --> 03:03.620 How many times we'd like to repeat this one? 03:03.860 --> 03:10.100 Well, maybe let's use str Len again. 03:10.100 --> 03:17.570 And I'm going to get the length of the name minus two. 03:17.600 --> 03:22.970 That's because I'd like to display the first and the last name. 03:23.750 --> 03:31.490 This means we need to finish off with another substring call for the name, and I can use negative offset 03:31.490 --> 03:37.280 which would basically move to the end of the string if I want the last letter. 03:37.310 --> 03:44.660 And I don't need to pass the length here because minus one is essentially moving from the end to, let's 03:44.660 --> 03:45.530 say this point. 03:45.530 --> 03:52.400 So from this string string I'm moving before G and then I'm going till the end. 03:52.430 --> 03:56.270 So that way I'm just getting the last letter. 03:57.080 --> 04:01.970 Let's add a semicolon in here and let's see if this works. 04:01.970 --> 04:03.080 Where is the name? 04:03.380 --> 04:08.060 The name is here we use HTML special chars as well. 04:08.090 --> 04:12.680 And I'm going to obfuscate the name. 04:13.100 --> 04:15.020 Now let's jump back to our app. 04:15.020 --> 04:17.330 And this is how it looks like. 04:18.710 --> 04:20.360 Okay so this was fine. 04:20.390 --> 04:25.310 Next up let's work on obfuscating the email. 04:25.310 --> 04:28.970 So we do obfuscate email. 04:30.590 --> 04:36.440 We need to get the string argument and we return the string as well. 04:36.860 --> 04:42.200 So here well we need to be wary of the domain. 04:42.200 --> 04:45.680 So let's get the parts of this email. 04:45.680 --> 04:52.470 First we're going to be using explode because with emails we are sure that there is an ad character, 04:52.470 --> 04:53.850 it has to be there. 04:53.910 --> 04:58.800 So we separate the obfuscate that part and this part. 04:59.850 --> 05:03.480 So from the email we are getting the parts. 05:03.510 --> 05:15.270 Now the username is the first part which would be indexed with zero and domain is the second part. 05:17.220 --> 05:23.910 So just to be sure we ask for the part with index one or if there is none. 05:24.180 --> 05:27.510 Somehow someone sneaked in an incorrect email. 05:27.540 --> 05:30.270 We get the default, which is an empty string. 05:31.440 --> 05:36.450 Okay, now let's obfuscate the username because I think we can keep the domain. 05:36.450 --> 05:38.280 That's not secret. 05:40.290 --> 05:42.360 So I can overwrite username. 05:42.360 --> 05:44.070 I think this is fine. 05:44.100 --> 05:49.350 So maybe let's get first two characters from the username. 05:49.350 --> 05:58.450 So starting at the index zero and taking two characters, we're going to join that with an STR repeat 05:58.450 --> 06:02.350 call where we repeat the asterisk. 06:02.470 --> 06:05.890 And then again we're going to get the str Len. 06:05.890 --> 06:12.550 So the length of the username minus two. 06:12.580 --> 06:19.930 We do that because here we just got the first two characters from the username. 06:19.960 --> 06:25.180 Now it might happen that the username is shorter than this. 06:25.180 --> 06:33.490 And for that cases not to have a negative number we're going to use the max function to pick the value 06:33.520 --> 06:34.270 that is bigger. 06:34.270 --> 06:39.100 That would be either zero or the length of the string minus two. 06:39.130 --> 06:48.110 So in case this ends up being negative, we just say that we repeat this asterisk zero Times. 06:49.640 --> 06:50.420 Okay. 06:50.450 --> 06:52.250 Let's add a semicolon. 06:52.760 --> 07:01.280 And finally we just need to return the username at domain. 07:02.060 --> 07:03.140 And we are done. 07:03.170 --> 07:05.300 Now let's see if this works fine. 07:05.330 --> 07:07.880 So where is the email. 07:08.630 --> 07:09.470 It's here. 07:09.470 --> 07:14.630 So I'm calling the obfuscate email and passing the data. 07:17.390 --> 07:19.910 And this is how it looks like I think it's fine. 07:19.910 --> 07:25.190 We just get two characters from the email and the rest are the asterisks. 07:25.190 --> 07:31.880 We don't need to match the amount of characters ideally, because it doesn't really matter. 07:32.060 --> 07:39.920 The most important part is that we hide some sensitive information to which we have access to, but 07:39.920 --> 07:43.070 our visitors don't need that. 07:44.570 --> 07:46.400 Okay, we are done.