build: inject wasm base64 into build_index.sh script

node/src/build_index.sh

@@ -3,3 +3,78 @@ SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
 
 cat $1/sxt_proof_of_sql_sdk_wasm.js $SCRIPT_DIR/index_tail.js > $SCRIPT_DIR/index.js
 cp $1/sxt_proof_of_sql_sdk_wasm_bg.wasm $SCRIPT_DIR
+
+# Enable error handling
+set -euo pipefail
+
+# Define an error handler to gracefully handle errors
+error_handler() {
+    echo "Error: Script encountered an issue. Exiting gracefully."
+    exit 1
+}
+
+# Trap errors and call the error handler
+trap error_handler ERR
+
+# Truncate the JavaScript file at the specified line
+truncate_js_file() {
+    local input_js_file=$1
+    local output_js_file=$2
+    if ! sed '/^const wasm_url = new URL('\''sxt_proof_of_sql_sdk_wasm_bg.wasm'\'', import.meta.url);/,$d' "$input_js_file" > "$output_js_file"; then
+        echo "Error: Failed to truncate the JavaScript file."
+        return 1
+    fi
+}
+
+# Base64-encode the WASM file and append it as a string to the JS file
+append_base64_wasm_to_js() {
+    local wasm_file=$1
+    local js_file=$2
+    if ! base64 "$wasm_file" > /dev/null 2>&1; then
+        echo "Error: Failed to Base64-encode the WASM file."
+        return 1
+    fi
+    local base64_wasm=$(base64 "$wasm_file")
+    echo -e "\n// Embedded WASM (Base64 Encoded)" >> "$js_file"
+    echo "let wasmCode = \`$base64_wasm\`;" >> "$js_file"
+    echo "const wasmBytes = Uint8Array.from(atob(wasmCode), c => c.charCodeAt(0));" >> "$js_file"
+}
+
+# Append WebAssembly instantiation code
+append_wasm_instantiation_code() {
+    local js_file=$1
+    echo -e "\n// Instantiate the WebAssembly module" >> "$js_file"
+    echo "const wasmInstance = (await WebAssembly.instantiate(wasmBytes, imports)).instance;" >> "$js_file"
+    echo "const wasm = wasmInstance.exports;" >> "$js_file"
+    echo "export const __wasm = wasm;" >> "$js_file"
+}
+
+# Main logic
+main() {
+    local input_js_file="sxt_proof_of_sql_sdk_wasm.js"
+    local wasm_file="sxt_proof_of_sql_sdk_wasm_bg.wasm"
+    local output_js_file="sxt_proof_of_sql_sdk_wasm_modified.js"
+
+    if [[ ! -f "$input_js_file" ]]; then
+        echo "Error: Input JavaScript file '$input_js_file' not found."
+        return 1
+    fi
+
+    if [[ ! -f "$wasm_file" ]]; then
+        echo "Error: WASM file '$wasm_file' not found."
+        return 1
+    fi
+
+    echo "Truncating the JavaScript file..."
+    truncate_js_file "$input_js_file" "$output_js_file" || return 1
+
+    echo "Embedding the Base64-encoded WASM file..."
+    append_base64_wasm_to_js "$wasm_file" "$output_js_file" || return 1
+
+    echo "Appending WebAssembly instantiation code..."
+    append_wasm_instantiation_code "$output_js_file" || return 1
+
+    echo "Modified JavaScript file created: $output_js_file"
+}
+
+main "$@"