SWA-Project/SWA-backend
2
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

added get endpoint for posts by id

Browse Source
This commit is contained in:
Timo Schneider
2024-05-25 15:47:14 +02:00
parent 5d494d0ad4
commit 4c1699c314
4 changed files with 148 additions and 31 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
src/main/java/de/anxietyprime/swajodel/JodelPost.java
View File

@@ -4,6 +4,8 @@ import java.util.Date;
import java.util.Optional;
import java.util.Vector;
import java.sql.*;
public class JodelPost {
// id of the post
public Long id;
@@ -24,7 +26,7 @@ public class JodelPost {
// the own reaction (null = none, true = positive, false = negative)
public Optional<Boolean> reaction;
// all other reactions
public Reaction reactions;
public Reactions reactions;
// anonymize function to recursively anonymize the posts
public void anonymize(Optional<Vector<Long>> idCache) {
@@ -70,8 +72,15 @@ public class JodelPost {
return false;
}
// constructor with private authorID
public JodelPost(long authorID) {
this.authorID = authorID;
// constructor from
public JodelPost(ResultSet rs) throws SQLException {
// add all other information to the post
this.authorID = rs.getLong("author");
this.id = rs.getLong("id");
this.title = rs.getString("title");
this.content = rs.getString("content");
this.date = rs.getDate("postdate");
this.location = new Location(rs.getLong("longitude"), rs.getLong("latitude"));
this.reactions = new Reactions(rs.getLong("positive"), rs.getLong("negative"));
}
}

6
src/main/java/de/anxietyprime/swajodel/Reaction.java
View File

@@ -1,6 +0,0 @@
package de.anxietyprime.swajodel;
public class Reaction {
private long positive;
private long negative;
}

11
src/main/java/de/anxietyprime/swajodel/Reactions.java Normal file
View File

@@ -0,0 +1,11 @@
package de.anxietyprime.swajodel;
public class Reactions {
public long positive;
public long negative;
Reactions(long positive, long negative) {
this.positive = positive;
this.negative = negative;
}
}

145
src/main/java/de/anxietyprime/swajodel/Routes.java
View File

@@ -1,8 +1,8 @@
package de.anxietyprime.swajodel;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.server.ResponseStatusException;
import java.sql.*;
@@ -13,7 +13,7 @@ import java.util.Vector;
public class Routes {
@GetMapping("/posts/{longitude}/{latitude}")
public Vector<JodelPost> getPosts(@PathVariable("longitude") float longitude, @PathVariable("latitude") float latitude) {
public Vector<JodelPost> getPostsByLocation(@PathVariable("longitude") float longitude, @PathVariable("latitude") float latitude) {
// list of all posts (not comments) in range
Vector<JodelPost> posts = new Vector<>();
@@ -36,20 +36,22 @@ public class Routes {
// create a new statement
stmt = c.prepareStatement("WITH RECURSIVE targets AS (\n" +
" SELECT\n" +
" id,\n" +
" id AS parent,\n" +
" author,\n" +
" title,\n" +
" content,\n" +
" postdate,\n" +
" postlocation[0] AS longitude,\n" +
" postlocation[1] AS latitude\n" +
" posts.id,\n" +
" posts.id AS parent,\n" +
" posts.author,\n" +
" posts.title,\n" +
" posts.content,\n" +
" posts.postdate,\n" +
" posts.postlocation[0] AS longitude,\n" +
" posts.postlocation[1] AS latitude,\n" +
" (SELECT count(*) FROM reaction WHERE reaction.post = posts.id AND positive = TRUE) AS positive,\n" +
" (SELECT count(*) FROM reaction WHERE reaction.post = posts.id AND positive = FALSE) AS negative\n" +
" FROM\n" +
" posts\n" +
" WHERE\n" +
" deleted IS NULL\n" +
" AND sqrt(power(postlocation[0] - (?), 2) + power(postlocation[1] - (?), 2)) <= 10\n" +
" AND id NOT IN (SELECT child FROM comments)\n" +
" AND posts.id NOT IN (SELECT child FROM comments)\n" +
" UNION\n" +
" SELECT\n" +
" com.child,\n" +
@@ -59,7 +61,9 @@ public class Routes {
" com.content,\n" +
" com.postdate,\n" +
" com.postlocation[0],\n" +
" com.postlocation[1]\n" +
" com.postlocation[1],\n" +
" (SELECT count(*) FROM reaction WHERE reaction.post = com.child AND positive = TRUE) AS positive,\n" +
" (SELECT count(*) FROM reaction WHERE reaction.post = com.child AND positive = FALSE) AS negative\n" +
" FROM\n" +
" (SELECT * FROM comments inner join posts ON comments.child = posts.id) com\n" +
" inner join targets ON targets.id = com.parent\n" +
@@ -75,13 +79,7 @@ public class Routes {
// for all the posts found
while ( rs.next() ) {
// create a post from the author id
JodelPost post = new JodelPost(rs.getLong("author"));
// add all other information to the post
post.id = rs.getLong("id");
post.title = rs.getString("title");
post.content = rs.getString("content");
post.date = rs.getDate("postdate");
post.location = new Location(rs.getLong("longitude"), rs.getLong("latitude"));
JodelPost post = new JodelPost(rs);
// get the posts parent
long parent = rs.getLong("parent");
@@ -111,6 +109,7 @@ public class Routes {
// else log the error
catch ( Exception e ) {
System.err.println( e.getClass().getName()+": "+ e.getMessage() );
throw new ResponseStatusException(HttpStatus.SERVICE_UNAVAILABLE, "Database is offline");
}
// calculate anonymous IDs for the posts
@@ -120,4 +119,108 @@ public class Routes {
// return the posts
return posts;
}
@GetMapping("/post/{id}")
public JodelPost getPostByID(@PathVariable("id") long id) {
// list of all posts (not comments) in range
Optional<JodelPost> root_post = Optional.empty();
// DB connection and statement
Connection c = null;
PreparedStatement stmt = null;
// try to get data from db
try {
// check for the driver
Class.forName("org.postgresql.Driver");
// get the connection with credentials from env variables
c = DriverManager
.getConnection("jdbc:postgresql://"+
System.getenv("POSTGRES_IP")+"/"+System.getenv("POSTGRES_DB"),
System.getenv("POSTGRES_USER"), System.getenv("POSTGRES_PASSWORD"));
// disable auto commits
c.setAutoCommit(false);
// create a new statement
stmt = c.prepareStatement("WITH RECURSIVE targets AS (\n" +
" SELECT\n" +
" posts.id,\n" +
" posts.id AS parent,\n" +
" posts.author,\n" +
" posts.title,\n" +
" posts.content,\n" +
" posts.postdate,\n" +
" posts.postlocation[0] AS longitude,\n" +
" posts.postlocation[1] AS latitude,\n" +
" (SELECT count(*) FROM reaction WHERE reaction.post = posts.id AND positive = TRUE) AS positive,\n" +
" (SELECT count(*) FROM reaction WHERE reaction.post = posts.id AND positive = FALSE) AS negative\n" +
" FROM\n" +
" posts\n" +
" WHERE\n" +
" deleted IS NULL\n" +
" AND posts.id = (?)\n" +
" AND posts.id NOT IN (SELECT child FROM comments)\n" +
" UNION\n" +
" SELECT\n" +
" com.child,\n" +
" com.parent,\n" +
" com.author,\n" +
" com.title,\n" +
" com.content,\n" +
" com.postdate,\n" +
" com.postlocation[0],\n" +
" com.postlocation[1],\n" +
" (SELECT count(*) FROM reaction WHERE reaction.post = com.child AND positive = TRUE) AS positive,\n" +
" (SELECT count(*) FROM reaction WHERE reaction.post = com.child AND positive = FALSE) AS negative\n" +
" FROM\n" +
" (SELECT * FROM comments inner join posts ON comments.child = posts.id) com\n" +
" inner join targets ON targets.id = com.parent\n" +
")\n" +
"SELECT * FROM targets;");
stmt.setObject(1, id);
// query recursively for posts inside a 10km radius
ResultSet rs = stmt.executeQuery();
// for all the posts found
while ( rs.next() ) {
// create a post from the author id
JodelPost post = new JodelPost(rs);
// get the posts parent
long parent = rs.getLong("parent");
// check if the parent is the own id
// if it is, it is a post
if (parent == post.id) {
// add the post to the posts
root_post = Optional.of(post);
}
// else it is a comment
else {
// try to add the post to parent
root_post.ifPresent(root -> root.addComment(post, parent));
}
}
// close all connections to db
rs.close();
stmt.close();
c.close();
}
// else log the error
catch ( Exception e ) {
System.err.println( e.getClass().getName()+": "+ e.getMessage() );
throw new ResponseStatusException(HttpStatus.SERVICE_UNAVAILABLE, "Database is offline");
}
// calculate anonymous IDs for the post
root_post.ifPresent(root -> root.anonymize(Optional.empty()));
// return the posts
if (root_post.isEmpty()) throw new ResponseStatusException(HttpStatus.NOT_FOUND, "No post found");
return root_post.get();
}
}