pub fn encode_json_value_to_metadatum(
value: Value,
schema: MetadataJsonSchema
) -> Result<TransactionMetadatum, JsError>Examples found in repository?
src/metadata.rs (line 512)
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pub fn encode_json_str_to_metadatum(
json: String,
schema: MetadataJsonSchema,
) -> Result<TransactionMetadatum, JsError> {
let value = serde_json::from_str(&json).map_err(|e| JsError::from_str(&e.to_string()))?;
encode_json_value_to_metadatum(value, schema)
}
pub fn encode_json_value_to_metadatum(
value: serde_json::Value,
schema: MetadataJsonSchema,
) -> Result<TransactionMetadatum, JsError> {
use serde_json::Value;
fn encode_number(x: serde_json::Number) -> Result<TransactionMetadatum, JsError> {
if let Some(x) = x.as_u64() {
Ok(TransactionMetadatum::new_int(&Int::new(&utils::to_bignum(
x,
))))
} else if let Some(x) = x.as_i64() {
Ok(TransactionMetadatum::new_int(&Int::new_negative(
&utils::to_bignum(-x as u64),
)))
} else {
Err(JsError::from_str("floats not allowed in metadata"))
}
}
fn encode_string(
s: String,
schema: MetadataJsonSchema,
) -> Result<TransactionMetadatum, JsError> {
if schema == MetadataJsonSchema::BasicConversions {
match hex_string_to_bytes(&s) {
Some(bytes) => TransactionMetadatum::new_bytes(bytes),
None => TransactionMetadatum::new_text(s),
}
} else {
TransactionMetadatum::new_text(s)
}
}
fn encode_array(
json_arr: Vec<Value>,
schema: MetadataJsonSchema,
) -> Result<TransactionMetadatum, JsError> {
let mut arr = MetadataList::new();
for value in json_arr {
arr.add(&encode_json_value_to_metadatum(value, schema)?);
}
Ok(TransactionMetadatum::new_list(&arr))
}
match schema {
MetadataJsonSchema::NoConversions | MetadataJsonSchema::BasicConversions => match value {
Value::Null => Err(JsError::from_str("null not allowed in metadata")),
Value::Bool(_) => Err(JsError::from_str("bools not allowed in metadata")),
Value::Number(x) => encode_number(x),
Value::String(s) => encode_string(s, schema),
Value::Array(json_arr) => encode_array(json_arr, schema),
Value::Object(json_obj) => {
let mut map = MetadataMap::new();
for (raw_key, value) in json_obj {
let key = if schema == MetadataJsonSchema::BasicConversions {
match raw_key.parse::<i128>() {
Ok(x) => TransactionMetadatum::new_int(&Int(x)),
Err(_) => encode_string(raw_key, schema)?,
}
} else {
TransactionMetadatum::new_text(raw_key)?
};
map.insert(&key, &encode_json_value_to_metadatum(value, schema)?);
}
Ok(TransactionMetadatum::new_map(&map))
}
},
// we rely on tagged objects to control parsing here instead
MetadataJsonSchema::DetailedSchema => match value {
Value::Object(obj) if obj.len() == 1 => {
let (k, v) = obj.into_iter().next().unwrap();
fn tag_mismatch() -> JsError {
JsError::from_str("key does not match type")
}
match k.as_str() {
"int" => match v {
Value::Number(x) => encode_number(x),
_ => Err(tag_mismatch()),
},
"string" => {
encode_string(v.as_str().ok_or_else(tag_mismatch)?.to_owned(), schema)
}
"bytes" => match hex::decode(v.as_str().ok_or_else(tag_mismatch)?) {
Ok(bytes) => TransactionMetadatum::new_bytes(bytes),
Err(_) => Err(JsError::from_str(
"invalid hex string in tagged byte-object",
)),
},
"list" => encode_array(v.as_array().ok_or_else(tag_mismatch)?.clone(), schema),
"map" => {
let mut map = MetadataMap::new();
fn map_entry_err() -> JsError {
JsError::from_str("entry format in detailed schema map object not correct. Needs to be of form {\"k\": \"key\", \"v\": value}")
}
for entry in v.as_array().ok_or_else(tag_mismatch)? {
let entry_obj = entry.as_object().ok_or_else(map_entry_err)?;
let raw_key = entry_obj.get("k").ok_or_else(map_entry_err)?;
let value = entry_obj.get("v").ok_or_else(map_entry_err)?;
let key = encode_json_value_to_metadatum(raw_key.clone(), schema)?;
map.insert(
&key,
&encode_json_value_to_metadatum(value.clone(), schema)?,
);
}
Ok(TransactionMetadatum::new_map(&map))
}
invalid_key => Err(JsError::from_str(&format!(
"key '{}' in tagged object not valid",
invalid_key
))),
}
}
_ => Err(JsError::from_str(
"DetailedSchema requires types to be tagged objects",
)),
},
}
}