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use crate::rule::model::BodyTransform;
use regex::Regex;
use relay_core_api::flow::BodyData;
use serde_json::Value;
pub fn apply_transform(body: &mut BodyData, transform: &BodyTransform) {
// Only transform if encoding is utf-8
if body.encoding != "utf-8" {
return;
}
match transform {
BodyTransform::RegexReplace {
pattern,
replacement,
} => {
if let Ok(re) = Regex::new(pattern) {
body.content = re.replace_all(&body.content, replacement).to_string();
}
}
BodyTransform::JsonPathSet { path, value } => {
if let Ok(mut v) = serde_json::from_str::<Value>(&body.content) {
let ptr = jsonpath_to_pointer(path);
// Try to parse value as JSON, else treat as string
let new_val = if let Ok(parsed) = serde_json::from_str::<Value>(value) {
parsed
} else {
Value::String(value.clone())
};
if let Some(target) = v.pointer_mut(&ptr) {
*target = new_val;
} else {
// Try to insert if parent exists
if let Some(last_slash) = ptr.rfind('/') {
let (parent_ptr, last_segment) = ptr.split_at(last_slash);
let last_segment = &last_segment[1..];
let parent = if parent_ptr.is_empty() {
Some(&mut v)
} else {
v.pointer_mut(parent_ptr)
};
if let Some(Value::Object(map)) = parent {
map.insert(last_segment.to_string(), new_val);
}
}
}
if let Ok(json_str) = serde_json::to_string(&v) {
body.content = json_str;
}
}
}
BodyTransform::JsonPathDelete { path } => {
if let Ok(mut v) = serde_json::from_str::<Value>(&body.content) {
let ptr = jsonpath_to_pointer(path);
// To delete, we need parent pointer and last key/index
// Handle root deletion? Not supported usually.
if let Some(last_slash) = ptr.rfind('/') {
let (parent_ptr, last_segment) = ptr.split_at(last_slash);
let last_segment = &last_segment[1..]; // Skip '/'
// parent_ptr might be empty if ptr is "/foo"
let parent = if parent_ptr.is_empty() {
Some(&mut v)
} else {
v.pointer_mut(parent_ptr)
};
if let Some(parent) = parent {
if let Value::Object(map) = parent {
map.remove(last_segment);
} else if let Value::Array(arr) = parent
&& let Ok(idx) = last_segment.parse::<usize>()
&& idx < arr.len()
{
arr.remove(idx);
}
}
}
if let Ok(json_str) = serde_json::to_string(&v) {
body.content = json_str;
}
}
}
}
}
fn escape_json_pointer(s: &str) -> String {
s.replace("~", "~0").replace("/", "~1")
}
fn jsonpath_to_pointer(path: &str) -> String {
if path.is_empty() || path == "$" {
return "".to_string();
}
let mut pointer = String::new();
let path = path.trim_start_matches('$');
let mut chars = path.chars().peekable();
// Handle first segment if it doesn't start with separator
if let Some(&c) = chars.peek()
&& c != '.'
&& c != '['
{
pointer.push('/');
}
while let Some(c) = chars.next() {
match c {
'.' => {
if !pointer.ends_with('/') {
pointer.push('/');
}
let mut content = String::new();
while let Some(&next) = chars.peek() {
if next == '.' || next == '[' {
break;
}
if let Some(c) = chars.next() {
content.push(c);
}
}
pointer.push_str(&escape_json_pointer(&content));
}
'[' => {
if !pointer.ends_with('/') {
pointer.push('/');
}
let mut content = String::new();
while let Some(&next) = chars.peek() {
if next == ']' {
chars.next(); // consume ']'
break;
}
if let Some(c) = chars.next() {
content.push(c);
}
}
let content = content.trim_matches('\'').trim_matches('"');
pointer.push_str(&escape_json_pointer(content));
}
c => {
// Start of a segment without dot (only possible at very beginning)
let mut content = String::new();
content.push(c);
while let Some(&next) = chars.peek() {
if next == '.' || next == '[' {
break;
}
if let Some(c) = chars.next() {
content.push(c);
}
}
pointer.push_str(&escape_json_pointer(&content));
}
}
}
pointer
}