Struct PolygonHandler 

pub struct PolygonHandler;

Polygon coordinate validator

Validates polygon coordinate strings in the format “(lat1,lon1,lat2,lon2,lat1,lon1)” and ensures proper polygon geometry (closed, minimum vertices, valid coordinates).

Implementations

impl PolygonHandler

pub fn validate_and_canonicalize( value: &str, field_name: &str, ) -> Result<String>

pub fn parse_polygon_coordinates(coord_string: &str) -> Result<Vec<(f64, f64)>>

Parse a polygon coordinate string into a vector of (lat, lon) tuples.

Accepted forms (whitespace tolerated everywhere):

• "(lat1,lon1,...,lat1,lon1)" — parenthesised, balanced
• "lat1,lon1,...,lat1,lon1" — no parentheses

Rejected forms (each with a specific error message):

• Opening ( without a matching closing ) (or vice versa)
• Embedded ( or ) anywhere except as the single outer pair
• Empty string or ()
• Odd number of comma-separated values
• Any value that does not parse as f64

This function ALWAYS returns (lat, lon) pairs. DO NOT swap here; only swap to (lon, lat) when passing to the geo crate.

pub fn calculate_bounding_box(coordinates: &[(f64, f64)]) -> String

Calculates bounding box for spatial filtering optimization This will be used later when we handle the payload and headers

pub fn parse_bbox_coordinates(s: &str) -> Result<(f64, f64, f64, f64)>