Implemented first steps of the security layer, and dockerized as well.

backend/src/security-layer/Dockerfile

@@ -0,0 +1,27 @@
+# syntax=docker/dockerfile:1
+
+FROM golang:1.22.5
+
+# Set destination for COPY
+WORKDIR /tmp/docker/security-layer
+
+# Download Go modules
+COPY ./container/go.mod ./container/go.sum ./
+RUN go mod download
+
+# Copy the source code. Note the slash at the end, as explained in
+# https://docs.docker.com/reference/dockerfile/#copy
+COPY ./container/*.go ./
+
+# Build
+RUN CGO_ENABLED=0 GOOS=linux go build -o /security-layer
+
+# Optional:
+# To bind to a TCP port, runtime parameters must be supplied to the docker command.
+# But we can document in the Dockerfile what ports
+# the application is going to listen on by default.
+# https://docs.docker.com/reference/dockerfile/#expose
+EXPOSE 8000
+
+# Run
+CMD ["/security-layer"]

backend/src/security-layer/container/go.mod

@@ -0,0 +1,35 @@
+module example.com/web-service-gin
+
+go 1.22.5
+
+require github.com/gin-gonic/gin v1.10.0
+
+require (
+	github.com/bytedance/sonic v1.11.6 // indirect
+	github.com/bytedance/sonic/loader v0.1.1 // indirect
+	github.com/cloudwego/base64x v0.1.4 // indirect
+	github.com/cloudwego/iasm v0.2.0 // indirect
+	github.com/gabriel-vasile/mimetype v1.4.3 // indirect
+	github.com/gin-contrib/sse v0.1.0 // indirect
+	github.com/go-playground/locales v0.14.1 // indirect
+	github.com/go-playground/universal-translator v0.18.1 // indirect
+	github.com/go-playground/validator/v10 v10.20.0 // indirect
+	github.com/goccy/go-json v0.10.2 // indirect
+	github.com/golang-jwt/jwt/v5 v5.2.1 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/klauspost/cpuid/v2 v2.2.7 // indirect
+	github.com/leodido/go-urn v1.4.0 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/pelletier/go-toml/v2 v2.2.2 // indirect
+	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
+	github.com/ugorji/go/codec v1.2.12 // indirect
+	golang.org/x/arch v0.8.0 // indirect
+	golang.org/x/crypto v0.23.0 // indirect
+	golang.org/x/net v0.25.0 // indirect
+	golang.org/x/sys v0.20.0 // indirect
+	golang.org/x/text v0.15.0 // indirect
+	google.golang.org/protobuf v1.34.1 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

backend/src/security-layer/container/go.sum

@@ -0,0 +1,81 @@
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backend/src/security-layer/container/main.go

@@ -0,0 +1,229 @@
+package main
+
+import (
+	"encoding/base64"
+	//"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"time"
+
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/rand"
+	"crypto/sha1"
+
+	"errors"
+	"strconv"
+	"strings"
+
+	"github.com/gin-gonic/gin"
+	"github.com/golang-jwt/jwt/v5"
+)
+
+// TODO: Test with 256 bits
+// TEST VALUES:
+// KEY: passphrasewhichneedstobe32bytes! 
+// INPUT: The ultimate question: of life, the universe, of everything!
+// SHA-1 HASH: 0c6ca28f5607d86e5426b46795e0fa827f1627d6
+// BASE64 HASH: string DGyij1YH2G5UJrRnleD6gn8WJ9Y=
+// AES OUTPUT: []uint8{104, 215, 184, 35, 194, 120, 115, 112, 133, 21, 160, 158, 11, 136, 201, 160, 233, 3, 12, 29, 133, 211, 207, 98, 35, 199, 89, 31, 203, 230, 39, 210, 225, 99, 96, 101, 3, 5, 198, 82, 243, 179, 176, 217, 8, 4, 63, 22, 134, 184, 68, 102, 255, 183, 176, 172, 6, 176, 249, 28, 127, 120, 235, 135, 73, 235, 249, 118, 194, 4, 137, 27, 158, 190, 134, 68, 21, 105, 26, 134, 10, 224, 233, 115, 28, 0, 153, 209}
+// HEX AES: "68 D7 B8 23 C2 78 73 70 85 15 A0 9E B 88 C9 A0 E9 3 C 1D 85 D3 CF 62 23 C7 59 1F CB E6 27 D2 E1 63 60 65 3 5 C6 52 F3 B3 B0 D9 8 4 3F 16 86 B8 44 66 FF B7 B0 AC 6 B0 F9 1C 7F 78 EB 87 49 EB F9 76 C2 4 89 1B 9E BE 86 44 15 69 1A 86 A E0 E9 73 1C 0 99 D1"
+
+var rawHash = "DGyij1YH2G5UJrRnleD6gn8WJ9Y="
+
+type Request struct {
+	//UserID    string `json:"id"`
+	Prompt string `json:"prompt"`
+	Sum    string `json:"sum"`
+}
+
+var requests []Request
+
+// TODO: Test if 256 bit key works.
+// TODO: Dynamically get key? Need to research best way to store private keys between two devices.
+var key = []byte("passphrasewhichneedstobe32bytes!")
+
+func verifyToken(tokenString string) error {
+	token, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
+		return key, nil
+	})
+
+	if err != nil {
+		return err
+	}
+
+	if !token.Valid {
+		return fmt.Errorf("invalid token")
+	}
+
+	return nil
+}
+
+func createToken(username string) (string, error) {
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256,
+		jwt.MapClaims{
+			"username": username,
+			"exp":      time.Now().Add(time.Hour * 24).Unix(),
+		})
+
+	tokenString, err := token.SignedString(key)
+	if err != nil {
+		return "", err
+	}
+
+	return tokenString, nil
+}
+
+func encrypt() {
+	text := []byte("The ultimate question: of life, the universe, of everything!")
+
+	// generate a new aes cipher using our 32 byte long key
+	c, err := aes.NewCipher(key)
+	// if there are any errors, handle them
+	if err != nil {
+		fmt.Println(err)
+	}
+
+	// gcm or Galois/Counter Mode, is a mode of operation
+	// for symmetric key cryptographic block ciphers
+	// - https://en.wikipedia.org/wiki/Galois/Counter_Mode
+	gcm, err := cipher.NewGCM(c)
+	// if any error generating new GCM
+	// handle them
+	if err != nil {
+		fmt.Println(err)
+	}
+
+	// creates a new byte array the size of the nonce
+	// which must be passed to Seal
+	nonce := make([]byte, gcm.NonceSize())
+	// populates our nonce with a cryptographically secure
+	// random sequence
+	if _, err = io.ReadFull(rand.Reader, nonce); err != nil {
+		fmt.Println(err)
+	}
+
+	// here we encrypt our text using the Seal function
+	// Seal encrypts and authenticates plaintext, authenticates the
+	// additional data and appends the result to dst, returning the updated
+	// slice. The nonce must be NonceSize() bytes long and unique for all
+	// time, for a given key.
+	fmt.Println(gcm.Seal(nonce, nonce, text, nil))
+
+	//// the WriteFile method returns an error if unsuccessful
+	//err = ioutil.WriteFile("myfile", gcm.Seal(nonce, nonce, text, nil), 0777)
+	//// handle this error
+	//if err != nil {
+	//	// print it out
+	//	fmt.Println(err)
+	//}
+}
+
+func convertHexToBytes(hexString *string) ([]uint8, error) {
+	// Handle nil pointer case
+	if hexString == nil {
+		return nil, errors.New("nil pointer provided for hex string")
+	}
+
+	// Split the hex string by spaces
+	hexBytes := strings.Fields(*hexString)
+
+	// Initialize an empty slice for uint8
+	data := make([]uint8, len(hexBytes))
+
+	// Iterate and convert each hex byte
+	for i, hexByte := range hexBytes {
+		// Convert each hex string to a uint8 value (handling errors)
+		value, err := strconv.ParseUint(hexByte, 16, 8)
+		if err != nil {
+			return nil, fmt.Errorf("error parsing hex byte '%s': %w", hexByte, err)
+		}
+
+		// Assign the converted value to the slice
+		data[i] = uint8(value)
+	}
+
+	// Return the slice of uint8 and any errors encountered
+	return data, nil
+}
+
+func decrypt(input *Request) bool {
+	//ciphertext, err := ioutil.ReadFile("myfile")
+	ciphertext, err := convertHexToBytes(&input.Prompt)
+
+	// if our program was unable to read the file
+	// print out the reason why it can't
+	if err != nil {
+		fmt.Println(err)
+	}
+
+	c, err := aes.NewCipher(key)
+	if err != nil {
+		fmt.Println(err)
+	}
+
+	gcm, err := cipher.NewGCM(c)
+	if err != nil {
+		fmt.Println(err)
+	}
+
+	nonceSize := gcm.NonceSize()
+	if len(ciphertext) < nonceSize {
+		fmt.Println(err)
+	}
+
+	nonce, ciphertext := ciphertext[:nonceSize], ciphertext[nonceSize:]
+	plaintext, err := gcm.Open(nil, nonce, ciphertext, nil)
+	if err != nil {
+		fmt.Println(err)
+	}
+	s := string(plaintext)
+	if validateHash(s) {
+		input.Prompt = s
+		return true
+	}
+	input.Prompt = "DATA CORRUPTED OR TAMPERED"
+	return false
+}
+
+// Validate there's no tampering with SHA-1 sum. The decrypted hash and the transmitted hash should be identical.
+func validateHash(decrypted string) bool {
+	// Calculate the SHA256 sum of the decrypted request
+	hasher := sha1.New()
+	hasher.Write([]byte(decrypted))
+	decryptedHashString := base64.URLEncoding.EncodeToString(hasher.Sum(nil))
+
+	// TODO: Add error handling if hash doesn't match.
+	return decryptedHashString == rawHash
+}
+
+// User HTTP GET request has the prompt decrypted and verified with a SHA-1 checksum.
+// If there's been no data corruption, re-construct user prompt for ollama
+// TODO: Eventually, add additional logic that will allow for re-direction and contextual awareness (pre-processing)
+func promptRequest(c *gin.Context) {
+	var newInput Request
+
+	//Call BindJSON to bind the received JSON to
+	if err := c.BindJSON(&newInput); err != nil {
+		return
+	}
+
+	if decrypt(&newInput) {
+		requests = append(requests, newInput)
+		c.IndentedJSON(http.StatusCreated, newInput) // TODO: Formulate prompt and transfer to AI layer to formulate new JSON response back
+	} else {
+		c.IndentedJSON(http.StatusBadRequest, gin.H{"message": "Failed checksum. Presumably data corrupted."})
+
+	}
+}
+
+func main() {
+	router := gin.Default()
+	router.POST("/prompt", promptRequest)
+
+	err := router.Run("0.0.0.0:8000")
+	if err != nil {
+		return
+	}
+}

backend/src/security-layer/test.sh

@@ -0,0 +1,14 @@
+# Build the Docker image.
+docker build --tag security-layer:latest .
+
+# Create a Docker container from the image and connect host port 8000 to container port 8000.
+docker run --name security-layer -d -p 8000:8000 security-layer:latest
+
+# Send a JSON request to the security layer within the Docker container.
+curl http://localhost:8000/prompt -d '{
+	"prompt": "68 D7 B8 23 C2 78 73 70 85 15 A0 9E B 88 C9 A0 E9 3 C 1D 85 D3 CF 62 23 C7 59 1F CB E6 27 D2 E1 63 60 65 3 5 C6 52 F3 B3 B0 D9 8 4 3F 16 86 B8 44 66 FF B7 B0 AC 6 B0 F9 1C 7F 78 EB 87 49 EB F9 76 C2 4 89 1B 9E BE 86 44 15 69 1A 86 A E0 E9 73 1C 0 99 D1",
+	"sum": "DGyij1YH2G5UJrRnleD6gn8WJ9Y="
+}'
+
+# Delete the container so the next build and container utilize code changes.
+docker rm -f security-layer

mobile/app/lib/main.dart

@@ -4,6 +4,7 @@ import 'package:app/components/conversations_list_widget.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:provider/provider.dart';
+import 'package:network_tools/network_tools.dart';
 
 import 'package:app/theme.dart';
 
@@ -57,9 +58,23 @@ class MyApp extends ConsumerWidget {
     const Center(child: ConversationsListWidget()),
   ];
 
+  Future<void> test() async {
+    for (final ActiveHost activeHost in await MdnsScanner.searchMdnsDevices()) {
+      final MdnsInfo? mdnsInfo = await activeHost.mdnsInfo;
+      print('''
+        Address: ${activeHost.address}
+        Port: ${mdnsInfo!.mdnsPort}
+        ServiceType: ${mdnsInfo.mdnsServiceType}
+        MdnsName: ${mdnsInfo.getOnlyTheStartOfMdnsName()}
+      ''');
+      // Do anything with the active host
+    }
+
+  }
+
   // This widget is the root of your application.
   @override
-  Widget build(BuildContext context, WidgetRef ref) {
+  Widget build(BuildContext context, WidgetRef ref) {o
     final selectedIndex = ref.watch(selectedIndexProvider);
 
     return MaterialApp(

mobile/app/pubspec.lock

@@ -25,6 +25,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.0.7"
+  args:
+    dependency: transitive
+    description:
+      name: args
+      sha256: "7cf60b9f0cc88203c5a190b4cd62a99feea42759a7fa695010eb5de1c0b2252a"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.5.0"
   async:
     dependency: transitive
     description:
@@ -193,6 +201,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.0.0"
+  csv:
+    dependency: transitive
+    description:
+      name: csv
+      sha256: c6aa2679b2a18cb57652920f674488d89712efaf4d3fdf2e537215b35fc19d6c
+      url: "https://pub.dev"
+    source: hosted
+    version: "6.0.0"
   cupertino_icons:
     dependency: "direct main"
     description:
@@ -201,6 +217,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.0.8"
+  dart_ping:
+    dependency: transitive
+    description:
+      name: dart_ping
+      sha256: "2f5418d0a5c64e53486caaac78677b25725b1e13c33c5be834ce874ea18bd24f"
+      url: "https://pub.dev"
+    source: hosted
+    version: "9.0.1"
   data_table_2:
     dependency: transitive
     description:
@@ -696,6 +720,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "4.0.0"
+  logging:
+    dependency: transitive
+    description:
+      name: logging
+      sha256: "623a88c9594aa774443aa3eb2d41807a48486b5613e67599fb4c41c0ad47c340"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.2.0"
   mapbox_search:
     dependency: transitive
     description:
@@ -752,6 +784,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.0.0"
+  multicast_dns:
+    dependency: transitive
+    description:
+      name: multicast_dns
+      sha256: "982c4cc4cda5f98dd477bddfd623e8e4bd1014e7dbf9e7b05052e14a5b550b99"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.3.2+7"
   native_device_orientation:
     dependency: transitive
     description:
@@ -768,6 +808,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.0.0"
+  network_tools:
+    dependency: "direct main"
+    description:
+      name: network_tools
+      sha256: cf5726a3c3edd82de5f6d6511cb618259a083225ccc2bdb8a55d87b37014cadf
+      url: "https://pub.dev"
+    source: hosted
+    version: "5.0.2"
   octo_image:
     dependency: transitive
     description:
@@ -920,6 +968,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.10.2"
+  process_run:
+    dependency: transitive
+    description:
+      name: process_run
+      sha256: "8d9c6198b98fbbfb511edd42e7364e24d85c163e47398919871b952dc86a423e"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.14.2"
   provider:
     dependency: "direct main"
     description:
@@ -928,6 +984,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "6.1.2"
+  pub_semver:
+    dependency: transitive
+    description:
+      name: pub_semver
+      sha256: "40d3ab1bbd474c4c2328c91e3a7df8c6dd629b79ece4c4bd04bee496a224fb0c"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.4"
   qr:
     dependency: transitive
     description:
@@ -984,6 +1048,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.1.0"
+  sembast:
+    dependency: transitive
+    description:
+      name: sembast
+      sha256: "2a768b145bee5c72ae78c2641842ee348a6d345172af1070a497293c44f65ae1"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.7.1+2"
   shared_preferences:
     dependency: transitive
     description:
@@ -1221,6 +1293,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.3.2"
+  universal_io:
+    dependency: transitive
+    description:
+      name: universal_io
+      sha256: "1722b2dcc462b4b2f3ee7d188dad008b6eb4c40bbd03a3de451d82c78bba9aad"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.2.2"
   url_launcher:
     dependency: transitive
     description:
@@ -1413,6 +1493,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.0.4"
+  yaml:
+    dependency: transitive
+    description:
+      name: yaml
+      sha256: "75769501ea3489fca56601ff33454fe45507ea3bfb014161abc3b43ae25989d5"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.1.2"
 sdks:
   dart: ">=3.4.3 <4.0.0"
   flutter: ">=3.22.0"

mobile/app/pubspec.yaml

@@ -49,6 +49,7 @@ dependencies:
   camera: ^0.11.0+1
   image_picker: ^1.1.2
   file_picker: ^8.0.6
+  network_tools: ^5.0.2
 dev_dependencies:
   flutter_test:
     sdk: flutter