implemented critical features in Restful Golang API which'll handle Neo4j interactions.

.gitignore

@@ -6,3 +6,4 @@ data/articles
 data/tmp
 data/neo4j
 import.sql
+eula.txt

backend/auth.go

@@ -0,0 +1,81 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	// "log"
+	"net/http"
+	"os"
+	// "strconv"
+	"strings"
+
+	"github.com/golang-jwt/jwt"
+)
+
+// Define a custom context key for storing user information
+var userCtxKey = &contextKey{"user"}
+
+type contextKey struct {
+	name string
+}
+
+// AuthMiddleware is our JWT verification middleware
+func auth_middleware(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		// 1. Extract the JWT from the request (e.g., Authorization header)
+		authHeader := r.Header.Get("Authorization")
+		if authHeader == "" {
+			http.Error(w, "Unauthorized", http.StatusUnauthorized)
+			return
+		}
+
+		tokenString := ""
+		parts := strings.Split(authHeader, " ")
+		if len(parts) == 2 && strings.ToLower(parts[0]) == "bearer" {
+			tokenString = parts[1]
+		} else {
+			http.Error(w, "Invalid Authorization header format", http.StatusUnauthorized)
+			return
+		}
+
+		// 2. Verify the JWT
+		token, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
+			// Validate the signing method
+			if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
+				return nil, fmt.Errorf("invalid signing method: %v", token.Header["alg"])
+			}
+			// Replace "your-secret-key" with your actual secret key
+			return []byte(os.Getenv("JWT_SECRET_KEY")), nil
+		})
+
+		if err != nil {
+			http.Error(w, "Invalid token", http.StatusUnauthorized)
+			return
+		}
+
+		if claims, ok := token.Claims.(jwt.MapClaims); ok && token.Valid {
+			// 3. Optionally, extract user information from the claims and add it to the request context
+			user_id_raw, ok := claims["user_id"].(float64)
+			if !ok {
+				http.Error(w, "Invalid user ID in token", http.StatusInternalServerError)
+				return
+			}
+
+			user_id := int(user_id_raw)
+
+			// Create a new context with the user information
+			ctx := context.WithValue(r.Context(), userCtxKey, user_id)
+			// Call the next handler in the chain, passing the new context
+			next.ServeHTTP(w, r.WithContext(ctx))
+		} else {
+			http.Error(w, "Invalid token claims", http.StatusUnauthorized)
+			return
+		}
+	})
+}
+
+// Helper function to extract user information from the context in your handlers
+func user_id_from_context(ctx context.Context) (int, bool) {
+	userID, ok := ctx.Value(userCtxKey).(int)
+	return userID, ok
+}

backend/go.mod

@@ -3,6 +3,7 @@ module the.hub/m
 go 1.24.2
 
 require (
+	github.com/golang-jwt/jwt v3.2.2+incompatible // indirect
 	github.com/gorilla/mux v1.8.1 // indirect
 	github.com/joho/godotenv v1.5.1 // indirect
 	github.com/neo4j/neo4j-go-driver/v5 v5.28.0 // indirect

backend/go.sum

@@ -1,3 +1,5 @@
+github.com/golang-jwt/jwt v3.2.2+incompatible h1:IfV12K8xAKAnZqdXVzCZ+TOjboZ2keLg81eXfW3O+oY=
+github.com/golang-jwt/jwt v3.2.2+incompatible/go.mod h1:8pz2t5EyA70fFQQSrl6XZXzqecmYZeUEB8OUGHkxJ+I=
 github.com/gorilla/mux v1.8.1 h1:TuBL49tXwgrFYWhqrNgrUNEY92u81SPhu7sTdzQEiWY=
 github.com/gorilla/mux v1.8.1/go.mod h1:AKf9I4AEqPTmMytcMc0KkNouC66V3BtZ4qD5fmWSiMQ=
 github.com/joho/godotenv v1.5.1 h1:7eLL/+HRGLY0ldzfGMeQkb7vMd0as4CfYvUVzLqw0N0=

backend/posts.go

@@ -2,46 +2,526 @@ package main
 
 import (
 	"context"
+	"encoding/json"
+	"strings"
+
 	// "encoding/json"
 	// "fmt"
 	// "io"
-	// "log"
+	"log"
 	"net/http"
+
 	// "os"
 	// "os/signal"
+	"strconv"
 	//"strings"
 	// "sync"
 	// "time"
-	// "github.com/gorilla/mux"
+	"github.com/gorilla/mux"
 	"github.com/neo4j/neo4j-go-driver/v5/neo4j"
 )
 
 func create_new_post(driver neo4j.DriverWithContext, driver_ctx context.Context) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Access-Control-Allow-Origin", "http://localhost:2025")
+
+		err := r.ParseMultipartForm(10 << 20) // Limit to 10MB
+		if err != nil {
+			log.Println("Unable to parse form:", err)
+			http.Error(w, "Unable to parse form", http.StatusBadRequest)
+			return
+		}
+
+		space_id, err := strconv.Atoi(r.FormValue("space_id"))
+		if err != nil {
+			log.Println("Invalid space id:", err)
+			http.Error(w, "Invalid space id.", http.StatusBadRequest)
+			return
+		}
+
+		// Required fields
+		user_id, ok := user_id_from_context(r.Context())
+		if !ok {
+			log.Println("Invalid user ID")
+			http.Error(w, "Invalid user ID", http.StatusBadRequest)
+			return
+		}
+
+		if !auth_user_in_space(driver, driver_ctx, user_id, space_id) {
+			log.Println("User", user_id, "attempted access to space", space_id, ", which is not allowed.")
+			http.Error(w, "You are not a member of that space.", http.StatusUnauthorized)
+			return
+		}
+
+		post_type := r.FormValue("post_type")
+		post_status := r.FormValue("post_status")
+		content := r.FormValue("content")
+		//create_space := r.FormValue("create_space")
+
+		if post_type == "" || content == "" || post_status == "" {
+			http.Error(w, "Missing required fields", http.StatusBadRequest)
+			return
+		}
+
+		// Optional fields
+		title := r.FormValue("title")
+		excerpt := r.FormValue("excerpt")
+		location := r.FormValue("location")
+		raw_topics := r.FormValue("topics")
+		// files := r.FormFile("files")   // Consider using r.FormFile for actual uploads
+		// images := r.Form("images") // Consider using r.Form for multiple URLs
+		// videos := r.Form("videos") // Consider using r.Form for multiple URLs
+
+		// TODO: Implement space retrieval or creation logic based on space_name and create_space
+
+		topics := []string{}
+		if raw_topics != "" {
+			topicList := strings.SplitSeq(raw_topics, ",")
+			for topic := range topicList {
+				trimmedTopic := strings.TrimSpace(topic)
+				if trimmedTopic != "" {
+					topics = append(topics, trimmedTopic)
+				}
+			}
+		}
+
+		topics_rel_stmt := ""
+		if len(topics) > 0 {
+			topics_rel_stmt = `
+				WITH p
+				FOREACH (topicName IN $topicsList |
+				  MERGE (t:Topic {name: topicName})
+				  CREATE (p)-[:TAGGED_WITH]->(t)
+				)
+			`
+		}
+
+		stmt := `
+			MATCH (u:User) WHERE id(u) = $user_id
+			MATCH (t:PostType) WHERE t.name = $post_type
+			MATCH (s:Space) WHERE id(s) = $space_id
+			MATCH (st:PostStatus) WHERE st.name = $post_status
+		
+			CREATE
+				(u)-[:CREATED {time: datetime()}]->(p:Post {
+					content: $content,
+					title: $title,
+					excerpt: $excerpt,
+					location: $location
+				})
+		
+			CREATE (p)-[:POST_TYPE]->(t)
+			CREATE (p)-[:IN_SPACE]->(s)
+			CREATE (p)-[:STATUS]->(st)
+		
+			` + topics_rel_stmt
+
+		stmt_args := map[string]any{
+			"user_id":     user_id,
+			"post_type":   post_type,
+			"space_id":    space_id,
+			"post_status": post_status,
+			"content":     content,
+			"title":       title,
+			"excerpt":     excerpt,
+			"location":    location,
+			"topicsList":  topics,
+		}
+
+		_, err = neo4j.ExecuteQuery(driver_ctx, driver, stmt, stmt_args, neo4j.EagerResultTransformer, neo4j.ExecuteQueryWithDatabase("neo4j"))
+
+		if err != nil {
+			log.Println("Error creating post:", err)
+			http.Error(w, "Failed to create post", http.StatusInternalServerError)
+			return
+		} else {
+			w.WriteHeader(http.StatusCreated)
+			w.Write([]byte("Post created successfully!"))
 			return
 		}
 	}
+}
+
+// TODO: Need to fix bug where only one topic/topic name are being returned in JSON response.
 
 func retrieve_all_posts(driver neo4j.DriverWithContext, driver_ctx context.Context) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Access-Control-Allow-Origin", "http://localhost:2025")
+
+		// TODO: Handle anonymous users.
+		user_id, ok := user_id_from_context(r.Context())
+		if !ok {
+			http.Error(w, "Invalid user ID.", http.StatusBadRequest)
+			return
+		}
+
+		stmt := `
+			MATCH (p:Post)-[:IN_SPACE]->(s:Space)
+			MATCH (u:User)-[:SPACE_MEMBER]->(s)
+			MATCH (s)-[:SPACE_TYPE]->(st:SpaceType)
+			MATCH (p)-[:POST_TYPE]->(pt:PostType)
+			MATCH (p)-[:STATUS]->(ps:PostStatus)
+			MATCH (p)-[:TAGGED_WITH]->(t:Topic)
+			MATCH (a:User)-[:CREATED]->(p)
+
+			WHERE
+				id(u) = $user_id AND
+				ps.name = "Published"
+
+			RETURN
+				id(a) AS author_id,
+				a.username AS author_username,
+				a.profile_picture AS author_picture,
+		
+				p.title AS title,
+				p.excerpt AS excerpt,
+				p.location AS location,
+				p.content AS content,
+				
+				pt.name AS post_type,
+				id(t) AS topic_id,
+				t.name AS topic_name,
+				
+				id(s) AS space_id,
+				s.name AS space_name,
+				st.name AS space_type
+		`
+
+		stmt_args := map[string]any{
+			"user_id": user_id,
+		}
+
+		result, err := neo4j.ExecuteQuery(driver_ctx, driver, stmt, stmt_args, neo4j.EagerResultTransformer, neo4j.ExecuteQueryWithDatabase("neo4j"))
+
+		if err != nil {
+			log.Println("Error retrieving all posts:", err)
+			http.Error(w, "Failed to retrieve all posts", http.StatusInternalServerError)
+			return
+		}
+
+		posts_obj := map[int]any{}
+
+		for index, record := range result.Records {
+			space_id, _ := record.Get("space_id")
+			space_id = int(space_id.(int64))
+			if !auth_user_in_space(driver, driver_ctx, user_id, space_id.(int)) {
+				http.Error(w, "You are not allowed in this space.", http.StatusUnauthorized)
+				return
+			}
+
+			author_id, _ := record.Get("author_id")
+			author_username, _ := record.Get("author_username")
+			author_picture, _ := record.Get("author_picture")
+
+			title, _ := record.Get("title")
+			excerpt, _ := record.Get("excerpt")
+			location, _ := record.Get("location")
+			content, _ := record.Get("content")
+
+			post_type, _ := record.Get("post_type")
+			topic_id, _ := record.Get("topic_id")
+			topic_name, _ := record.Get("topic_name")
+			space_name, _ := record.Get("space_name")
+
+			record_obj := map[string]any{
+				"author_id":       author_id,
+				"author_username": author_username,
+				"author_picture":  author_picture,
+				"title":           title,
+				"excerpt":         excerpt,
+				"location":        location,
+				"content":         content,
+				"post_type":       post_type,
+				"topic_id":        topic_id,
+				"topic_name":      topic_name,
+				"space_id":        space_id,
+				"space_name":      space_name,
+			}
+
+			posts_obj[index] = record_obj
+		}
+
+		obj, err := json.Marshal(posts_obj)
+		if err != nil {
+			http.Error(w, "Failed to parse into JSON", http.StatusInternalServerError)
+			log.Println("error marshalling json")
+			return
+		}
+
+		w.WriteHeader(http.StatusOK)
+		w.Write(obj)
 		return
 	}
 }
 
+// TODO: Need to fix bug where only one topic/topic name are being returned in JSON response.
 func retrieve_post(driver neo4j.DriverWithContext, driver_ctx context.Context) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Access-Control-Allow-Origin", "http://localhost:2025")
+
+		// TODO: Handle anonymous users.
+		user_id, ok := user_id_from_context(r.Context())
+		if !ok {
+			http.Error(w, "Invalid user ID.", http.StatusBadRequest)
+			return
+		}
+
+		post_id, err := strconv.Atoi(mux.Vars(r)["post_id"])
+		if err != nil {
+			http.Error(w, "Invalid Post ID.", http.StatusBadRequest)
+			return
+		}
+
+		stmt := `
+			MATCH (p:Post)-[:IN_SPACE]->(s:Space) 
+			MATCH (s)-[:SPACE_TYPE]->(st:SpaceType)
+			MATCH (p)-[:POST_TYPE]->(pt:PostType)
+			MATCH (p)-[:STATUS]->(ps:PostStatus)
+			MATCH (p)-[:TAGGED_WITH]->(t:Topic)
+			MATCH (a:User)-[:CREATED]->(p)
+			
+			WHERE
+				id(p) = $post_id
+		
+			RETURN
+				id(a) AS author_id,
+				a.username AS author_username,
+				a.profile_picture AS author_picture,
+		
+				p.title AS title,
+				p.excerpt AS excerpt,
+				p.location AS location,
+				p.content AS content,
+				
+				pt.name AS post_type,
+				ps.name AS post_status,
+				id(t) AS topic_id,
+				t.name AS topic_name,
+				
+				id(s) AS space_id,
+				st.name AS space_type
+		`
+
+		stmt_args := map[string]any{
+			"post_id": post_id,
+		}
+
+		result, err := neo4j.ExecuteQuery(driver_ctx, driver, stmt, stmt_args, neo4j.EagerResultTransformer, neo4j.ExecuteQueryWithDatabase("neo4j"))
+		if err != nil {
+			http.Error(w, "Failed to retrieve Post.", http.StatusInternalServerError)
+			return
+		}
+
+		if len(result.Records) != 2 {
+			http.Error(w, "Post does not exist.", http.StatusBadRequest)
+			return
+		}
+
+		record := result.Records[0]
+		space_id, _ := record.Get("space_id")
+		space_id = int(space_id.(int64))
+		if !auth_user_in_space(driver, driver_ctx, user_id, space_id.(int)) {
+			http.Error(w, "You are not allowed in this space.", http.StatusUnauthorized)
+			return
+		}
+
+		author_id, _ := record.Get("author_id")
+		author_username, _ := record.Get("author_username")
+		author_picture, _ := record.Get("author_picture")
+		title, _ := record.Get("title")
+		excerpt, _ := record.Get("excerpt")
+		location, _ := record.Get("location")
+		content, _ := record.Get("content")
+		post_type, _ := record.Get("post_type")
+		post_status, _ := record.Get("post_status")
+		topic_id, _ := record.Get("topic_id")
+		topic_name, _ := record.Get("topic_name")
+		space_type, _ := record.Get("space_type")
+
+		record_obj := map[string]any{
+			"author_id":       author_id,
+			"author_username": author_username,
+			"author_picture":  author_picture,
+			"title":           title,
+			"excerpt":         excerpt,
+			"location":        location,
+			"content":         content,
+			"post_type":       post_type,
+			"post_status":     post_status,
+			"topic_id":        topic_id,
+			"topic_name":      topic_name,
+			"space_id":        space_id,
+			"space_type":      space_type,
+		}
+
+		obj, err := json.Marshal(record_obj)
+		if err != nil {
+			http.Error(w, "Failed to parse into JSON", http.StatusInternalServerError)
+			log.Println("error marshalling json")
+			return
+		}
+
+		w.WriteHeader(http.StatusOK)
+		w.Write(obj)
 		return
 	}
 }
 
+// TODO: Need to test.
 func update_post(driver neo4j.DriverWithContext, driver_ctx context.Context) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Access-Control-Allow-Origin", "http://localhost:2025")
+
+		err := r.ParseMultipartForm(10 << 20) // Limit to 10MB
+		if err != nil {
+			log.Println("Unable to parse form:", err)
+			http.Error(w, "Unable to parse form", http.StatusBadRequest)
+			return
+		}
+
+		space_id, err := strconv.Atoi(r.FormValue("space_id"))
+		if err != nil {
+			log.Println("Invalid space id:", err)
+			http.Error(w, "Invalid space id.", http.StatusBadRequest)
+			return
+		}
+
+		user_id, ok := user_id_from_context(r.Context())
+		if !ok {
+			http.Error(w, "Invalid user ID.", http.StatusUnauthorized)
+			return
+		}
+
+		if !auth_user_in_space(driver, driver_ctx, user_id, space_id) {
+			log.Println("User", user_id, "attempted access to space", space_id, ", which is not allowed.")
+			http.Error(w, "You are not a member of that space.", http.StatusUnauthorized)
+			return
+		}
+
+		post_id, err := strconv.Atoi(mux.Vars(r)["post_id"])
+		if err != nil {
+			http.Error(w, "Failed to get Post ID.", http.StatusInternalServerError)
+			return
+		}
+
+		post_type := r.FormValue("post_type")
+		post_status := r.FormValue("post_status")
+		content := r.FormValue("content")
+		//create_space := r.FormValue("create_space")
+
+		if post_type == "" || content == "" || post_status == "" {
+			http.Error(w, "Missing required fields.", http.StatusBadRequest)
+			return
+		}
+
+		// Optional fields
+		title := r.FormValue("title")
+		excerpt := r.FormValue("excerpt")
+		location := r.FormValue("location")
+		raw_topics := r.FormValue("topics")
+		// files := r.FormFile("files")   // Consider using r.FormFile for actual uploads
+		// images := r.Form("images") // Consider using r.Form for multiple URLs
+		// videos := r.Form("videos") // Consider using r.Form for multiple URLs
+
+		// TODO: Implement space retrieval or creation logic based on space_name and create_space
+
+		topics := []string{}
+		if raw_topics != "" {
+			topicList := strings.SplitSeq(raw_topics, ",")
+			for topic := range topicList {
+				trimmedTopic := strings.TrimSpace(topic)
+				if trimmedTopic != "" {
+					topics = append(topics, trimmedTopic)
+				}
+			}
+		}
+
+		topics_rel_stmt := ""
+		if len(topics) > 0 {
+			topics_rel_stmt = `
+				WITH p
+				FOREACH (topicName IN $topicsList |
+				  MERGE (t:Topic {name: topicName})
+				  MERGE (p)-[:TAGGED_WITH]->(t)
+				)
+			`
+		}
+
+		stmt := `
+			MATCH (u:User) WHERE id(u) = $user_id
+			MATCH (t:PostType) WHERE t.name = $post_type
+			MATCH (s:Space) WHERE id(s) = $space_id
+			MATCH (st:PostStatus) WHERE st.name = $post_status
+		
+			SET
+				p.content = $content,
+				p.title = $title,
+				p.excerpt = $excerpt,
+				p.location = $location,
+				p.updated_at = datetime()
+			
+		
+			MERGE (p)-[:POST_TYPE]->(t)
+			MERGE (p)-[:IN_SPACE]->(s)
+			MERGE (p)-[:STATUS]->(st)
+		
+			` + topics_rel_stmt
+
+		stmt_args := map[string]any{
+			"user_id":     user_id,
+			"post_type":   post_type,
+			"space_id":    space_id,
+			"post_status": post_status,
+			"content":     content,
+			"title":       title,
+			"excerpt":     excerpt,
+			"location":    location,
+			"topicsList":  topics,
+		}
+
+		_, err = neo4j.ExecuteQuery(driver_ctx, driver, stmt, stmt_args, neo4j.EagerResultTransformer, neo4j.ExecuteQueryWithDatabase("neo4j"))
+		if err != nil {
+			log.Println("Attempted to update Post", post_id, "which failed.")
+			http.Error(w, "Unable to update Post.", http.StatusInternalServerError)
+			return
+		}
+
+		w.WriteHeader(http.StatusOK)
 		return
 	}
 }
 
 func delete_post(driver neo4j.DriverWithContext, driver_ctx context.Context) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Access-Control-Allow-Origin", "http://localhost:2025")
+
+		user_id, ok := user_id_from_context(r.Context())
+		if !ok {
+			http.Error(w, "Invalid user ID.", http.StatusUnauthorized)
+			return
+		}
+
+		post_id, err := strconv.Atoi(mux.Vars(r)["post_id"])
+		if err != nil {
+			http.Error(w, "Invalid Post ID.", http.StatusBadRequest)
+			return
+		}
+
+		stmt := "MATCH (u:User)-[:CREATED]->(p:Post) WHERE id(u) = $user_id AND id(p) = $post_id DETACH DELETE p"
+
+		stmt_args := map[string]any{
+			"user_id": user_id,
+			"post_id": post_id,
+		}
+
+		_, err = neo4j.ExecuteQuery(driver_ctx, driver, stmt, stmt_args, neo4j.EagerResultTransformer, neo4j.ExecuteQueryWithDatabase("neo4j"))
+
+		if err != nil {
+			http.Error(w, "Unable to delete Post.", http.StatusInternalServerError)
+			return
+		}
+
+		w.WriteHeader(http.StatusOK)
 		return
 	}
 }

backend/router.go

@@ -59,14 +59,16 @@ func serve() {
 		"/users/{user_id}",
 		"/users/{user_id}/posts",
 		"/users/{user_id}/spaces",
+
 		"/spaces",
 		"/spaces",
 		"/spaces/{space_id}",
-		"/spaces/{space_id}",
+		//"/spaces/{space_id}",
 		"/spaces/{space_id}",
 		"/spaces/{space_id}",
 		"/spaces/{space_id}/users",
 		"/spaces/{space_id}/posts",
+
 		"/posts",
 		"/posts",
 		"/posts/{post_id}",
@@ -83,14 +85,16 @@ func serve() {
 		http.MethodDelete,
 		http.MethodGet,
 		http.MethodGet,
+
 		http.MethodPost,
 		http.MethodGet,
 		http.MethodGet,
-		http.MethodPost,
+		//http.MethodPost,
 		http.MethodPatch,
 		http.MethodDelete,
 		http.MethodGet,
 		http.MethodGet,
+
 		http.MethodPost,
 		http.MethodGet,
 		http.MethodGet,
@@ -107,14 +111,16 @@ func serve() {
 		delete_user(driver, driver_ctx),
 		retrieve_users_posts(driver, driver_ctx),
 		retrieve_users_spaces(driver, driver_ctx),
+
 		create_new_space(driver, driver_ctx),
 		retrieve_all_spaces(driver, driver_ctx),
 		retrieve_space(driver, driver_ctx),
-		auth_user_in_space(driver, driver_ctx),
+		//auth_user_in_space(driver, driver_ctx),
 		update_space(driver, driver_ctx),
 		delete_space(driver, driver_ctx),
 		retrieve_spaces_users(driver, driver_ctx),
 		retrieve_spaces_posts(driver, driver_ctx),
+
 		create_new_post(driver, driver_ctx),
 		retrieve_all_posts(driver, driver_ctx),
 		retrieve_post(driver, driver_ctx),

backend/serveAPI.go

@@ -24,6 +24,7 @@ func ServeApi(
 	for i := range endpoints {
 		apiR.HandleFunc(endpoints[i], functions[i]).Methods(methods[i])
 	}
+	apiR.Use(auth_middleware)
 
 	apiSrv := &http.Server{
 		Addr:         "0.0.0.0:" + port,

backend/spaces.go

@@ -2,26 +2,108 @@ package main
 
 import (
 	"context"
-	// "encoding/json"
+	"encoding/json"
 	// "fmt"
 	//"io"
-	// "log"
+	"log"
 	"net/http"
 	// "os"
 	// "os/signal"
+	"strconv"
 	//"strings"
 	// "sync"
 	// "time"
-	// "github.com/gorilla/mux"
+	"github.com/gorilla/mux"
 	"github.com/neo4j/neo4j-go-driver/v5/neo4j"
 )
 
+// TODO: Need to test.
 func create_new_space(driver neo4j.DriverWithContext, driver_ctx context.Context) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Access-Control-Allow-Origin", "http://localhost:2025")
+
+		// Must be a user to create a space.
+		user_id, ok := user_id_from_context(r.Context())
+		if !ok {
+			log.Println("Invalid user ID")
+			http.Error(w, "Invalid user ID", http.StatusBadRequest)
+			return
+		}
+
+		err := r.ParseMultipartForm(10 << 20) // Limit to 10MB
+		if err != nil {
+			log.Println("Unable to parse form:", err)
+			http.Error(w, "Unable to parse form", http.StatusBadRequest)
+			return
+		}
+
+		var space map[string]any
+		err = json.NewDecoder(r.Body).Decode(&space)
+
+		if space["id"] != -1 {
+			log.Println("Attempt to create a space with a defined ID")
+			http.Error(w, "Space ID cannot be provided.", http.StatusBadRequest)
+			return
+		}
+
+		stmt := `
+			MATCH (owner:User)
+			WHERE id(owner) = $user_id
+
+			CREATE (s:Space {
+				created_at: datetime(),
+				name: $name,
+				description: $description
+			})
+
+			CREATE (owner)-[:SPACE_MEMBER {role: "Owner"}]->(s)
+
+			UNWIND $members as member
+				MATCH (m:User)
+				WHERE id(m) = member.id
+				CREATE (m)-[:SPACE_MEMBER {role: member.role}]->(s)
+
+			RETURN id(s) AS id,
+				s.name AS name
+		`
+
+		stmt_args := map[string]any{
+			"user_id":     user_id,
+			"name":        space["name"],
+			"description": space["description"],
+			"members":     space["members"],
+		}
+
+		result, err := neo4j.ExecuteQuery(driver_ctx, driver, stmt, stmt_args, neo4j.EagerResultTransformer, neo4j.ExecuteQueryWithDatabase("neo4j"))
+
+		if err != nil || len(result.Records) != 2 {
+			log.Println("Error creating Space:", err)
+			http.Error(w, "Failed to create Space", http.StatusInternalServerError)
+			return
+		}
+
+		record := result.Records[0]
+		space_id, _ := record.Get("id")
+		space_name, _ := record.Get("name")
+
+		record_obj := map[string]any{
+			"space_id":   space_id,
+			"space_name": space_name,
+		}
+
+		obj, err := json.Marshal(record_obj)
+		if err != nil {
+			http.Error(w, "Failed to marshal JSON.", http.StatusInternalServerError)
+			return
+		}
+
+		w.WriteHeader(http.StatusCreated)
+		w.Write(obj)
 		return
 	}
 }
 
+// TODO: Need to implement for ADMIN ONLY
 func retrieve_all_spaces(driver neo4j.DriverWithContext, driver_ctx context.Context) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
 		return
@@ -34,30 +116,156 @@ func retrieve_space(driver neo4j.DriverWithContext, driver_ctx context.Context)
 	}
 }
 
-func auth_user_in_space(driver neo4j.DriverWithContext, driver_ctx context.Context) http.HandlerFunc {
+// TODO: Implement access for Public and Open Spaces
-	return func(w http.ResponseWriter, r *http.Request) {
+func auth_user_in_space(driver neo4j.DriverWithContext, driver_ctx context.Context, user_id int, space_id int) bool {
-		return
+	stmt := `
+		MATCH (u:User), (s:Space)
+			WHERE id(u) = $user_id AND id(s) = $space_id
+			RETURN EXISTS((u)-[:SPACE_MEMBER]->(s))
+	`
+
+	stmt_args := map[string]any{
+		"user_id":  user_id,
+		"space_id": space_id,
+	}
+
+	result, err := neo4j.ExecuteQuery(driver_ctx, driver, stmt, stmt_args, neo4j.EagerResultTransformer, neo4j.ExecuteQueryWithDatabase("neo4j"))
+	if err != nil {
+		log.Println("Something went wrong authorizing the user to a space.")
+		return false
+	}
+
+	if len(result.Records) > 0 {
+		return result.Records[0].Values[0].(bool)
+	} else {
+		return false
 	}
 }
 
+// TODO: Implement
 func update_space(driver neo4j.DriverWithContext, driver_ctx context.Context) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 }
 
+// TODO: Implement
 func delete_space(driver neo4j.DriverWithContext, driver_ctx context.Context) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 }
 
+// TODO: Need to handle multiple topics.
 func retrieve_spaces_posts(driver neo4j.DriverWithContext, driver_ctx context.Context) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Access-Control-Allow-Origin", "http://localhost:2025")
+
+		// Must be a user to create a space.
+		user_id, ok := user_id_from_context(r.Context())
+		if !ok {
+			log.Println("Invalid user ID")
+			http.Error(w, "Invalid user ID", http.StatusBadRequest)
+			return
+		}
+
+		space_id, _ := strconv.Atoi(mux.Vars(r)["space_id"])
+
+		if !auth_user_in_space(driver, driver_ctx, user_id, space_id) {
+			log.Println("User", user_id, "attempted access to space", space_id, ", which is not allowed.")
+			http.Error(w, "You are not a member of that space.", http.StatusUnauthorized)
+			return
+		}
+
+		stmt := `
+			MATCH (p:Post)-[:IN_SPACE]->(s:Space)
+			MATCH (s)-[:SPACE_TYPE]->(st:SpaceType)
+			MATCH (p)-[:POST_TYPE]->(pt:PostType)
+			MATCH (p)-[:STATUS]->(ps:PostStatus)
+			MATCH (p)-[:TAGGED_WITH]->(t:Topic)
+			MATCH (a:User)-[:CREATED]->(p)
+
+			WHERE
+				id(s) = $space_id AND
+				ps.name = "Published"
+
+			RETURN
+				id(a) AS author_id,
+				a.username AS author_username,
+				a.profile_picture AS author_picture,
+		
+				p.title AS title,
+				p.excerpt AS excerpt,
+				p.location AS location,
+				p.content AS content,
+				
+				pt.name AS post_type,
+				id(t) AS topic_id,
+				t.name AS topic_name,
+				
+				s.name AS space_name,
+		`
+
+		stmt_args := map[string]any{
+			"space_id": space_id,
+		}
+
+		result, err := neo4j.ExecuteQuery(driver_ctx, driver, stmt, stmt_args, neo4j.EagerResultTransformer, neo4j.ExecuteQueryWithDatabase("neo4j"))
+
+		if !(len(result.Records) >= 2) {
+			log.Println("Failed to retrieve Posts for Space", space_id, ". Error:", err)
+			http.Error(w, "Error retrieving Posts from Space.", http.StatusInternalServerError)
+			return
+		}
+
+		posts_obj := map[int]any{}
+		for index, record := range result.Records {
+
+			author_id, _ := record.Get("author_id")
+			author_username, _ := record.Get("author_username")
+			author_picture, _ := record.Get("author_picture")
+
+			title, _ := record.Get("title")
+			excerpt, _ := record.Get("excerpt")
+			location, _ := record.Get("location")
+			content, _ := record.Get("content")
+
+			post_type, _ := record.Get("post_type")
+			topic_id, _ := record.Get("topic_id")
+			topic_name, _ := record.Get("topic_name")
+			space_name, _ := record.Get("space_name")
+
+			record_obj := map[string]any{
+				"author_id":       author_id,
+				"author_username": author_username,
+				"author_picture":  author_picture,
+				"title":           title,
+				"excerpt":         excerpt,
+				"location":        location,
+				"content":         content,
+				"post_type":       post_type,
+				"topic_id":        topic_id,
+				"topic_name":      topic_name,
+				"space_name":      space_name,
+			}
+
+			posts_obj[index] = record_obj
+		}
+
+		obj, err := json.Marshal(posts_obj)
+		if err != nil {
+			http.Error(w, "Failed to parse into JSON", http.StatusInternalServerError)
+			log.Println("error marshalling json")
+			return
+		}
+
+		w.WriteHeader(http.StatusOK)
+		w.Write(obj)
 		return
 	}
 }
 
+// TODO: Implement for Space Member role == Administrator OR role == Owner
 func retrieve_spaces_users(driver neo4j.DriverWithContext, driver_ctx context.Context) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
 		return

components/head.php

@@ -5,7 +5,7 @@
   <link href="css/base.css" rel="stylesheet" type="text/css">
   <link href="css/rewrite.css" rel="stylesheet" type="text/css">
   <link rel="stylesheet" href="https://nerdfonts.com/assets/css/webfont.css">
-  <link rel="icon" type="image/x-icon" href="data/vintagecoding-favicon.png" </link>
+  <link rel="icon" type="image/x-icon" href="data/vintagecoding-favicon.png">
   <?php
   if (!isset($_SESSION['theme']) || $_SESSION['theme'] == 'dark')
     echo '<link href="css/dark.css" rel="stylesheet" type="text/css">';