feat: add export/import commands for batch backup (JSON/TOML/YAML)

- export: filter by namespace/kind/name/tag/query, decrypt secrets, write to file or stdout
- import: parse file, conflict check (error by default, --force to overwrite), --dry-run preview
- Add ExportFormat enum, ExportData/ExportEntry in models.rs with TOML↔JSON conversion
- Bump version to 0.9.0

Made-with: Cursor

src/models.rs

@@ -1,6 +1,7 @@
 use chrono::{DateTime, Utc};
 use serde::{Deserialize, Serialize};
 use serde_json::Value;
+use std::collections::BTreeMap;
 use uuid::Uuid;
 
 /// A top-level entry (server, service, key, …).
@@ -36,3 +37,169 @@ pub struct SecretField {
     pub created_at: DateTime<Utc>,
     pub updated_at: DateTime<Utc>,
 }
+
+// ── Export / Import types ──────────────────────────────────────────────────────
+
+/// Supported file formats for export/import.
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub enum ExportFormat {
+    Json,
+    Toml,
+    Yaml,
+}
+
+impl ExportFormat {
+    /// Infer format from file extension (.json / .toml / .yaml / .yml).
+    pub fn from_extension(path: &str) -> anyhow::Result<Self> {
+        let ext = path.rsplit('.').next().unwrap_or("").to_lowercase();
+        match ext.as_str() {
+            "json" => Ok(Self::Json),
+            "toml" => Ok(Self::Toml),
+            "yaml" | "yml" => Ok(Self::Yaml),
+            other => anyhow::bail!(
+                "Cannot infer format from extension '.{}'. Use --format json|toml|yaml",
+                other
+            ),
+        }
+    }
+
+    /// Parse from --format CLI value.
+    pub fn from_str(s: &str) -> anyhow::Result<Self> {
+        match s.to_lowercase().as_str() {
+            "json" => Ok(Self::Json),
+            "toml" => Ok(Self::Toml),
+            "yaml" | "yml" => Ok(Self::Yaml),
+            other => anyhow::bail!("Unknown format '{}'. Expected: json, toml, or yaml", other),
+        }
+    }
+
+    /// Serialize ExportData to a string in this format.
+    pub fn serialize(&self, data: &ExportData) -> anyhow::Result<String> {
+        match self {
+            Self::Json => Ok(serde_json::to_string_pretty(data)?),
+            Self::Toml => {
+                let toml_val = json_to_toml_value(&serde_json::to_value(data)?)?;
+                toml::to_string_pretty(&toml_val)
+                    .map_err(|e| anyhow::anyhow!("TOML serialization failed: {}", e))
+            }
+            Self::Yaml => serde_yaml::to_string(data)
+                .map_err(|e| anyhow::anyhow!("YAML serialization failed: {}", e)),
+        }
+    }
+
+    /// Deserialize ExportData from a string in this format.
+    pub fn deserialize(&self, content: &str) -> anyhow::Result<ExportData> {
+        match self {
+            Self::Json => Ok(serde_json::from_str(content)?),
+            Self::Toml => {
+                let toml_val: toml::Value = toml::from_str(content)
+                    .map_err(|e| anyhow::anyhow!("TOML parse error: {}", e))?;
+                let json_val = toml_to_json_value(&toml_val);
+                Ok(serde_json::from_value(json_val)?)
+            }
+            Self::Yaml => serde_yaml::from_str(content)
+                .map_err(|e| anyhow::anyhow!("YAML parse error: {}", e)),
+        }
+    }
+}
+
+/// Top-level structure for export/import files.
+#[derive(Debug, Serialize, Deserialize)]
+pub struct ExportData {
+    pub version: u32,
+    pub exported_at: String,
+    pub entries: Vec<ExportEntry>,
+}
+
+/// A single entry with decrypted secrets for export/import.
+#[derive(Debug, Serialize, Deserialize)]
+pub struct ExportEntry {
+    pub namespace: String,
+    pub kind: String,
+    pub name: String,
+    #[serde(default)]
+    pub tags: Vec<String>,
+    #[serde(default)]
+    pub metadata: Value,
+    /// Decrypted secret fields. None means no secrets in this export (--no-secrets).
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub secrets: Option<BTreeMap<String, Value>>,
+}
+
+// ── TOML ↔ JSON value conversion ──────────────────────────────────────────────
+
+/// Convert a serde_json Value to a toml Value.
+/// `null` values are filtered out (TOML does not support null).
+/// Mixed-type arrays are serialised as JSON strings.
+pub fn json_to_toml_value(v: &Value) -> anyhow::Result<toml::Value> {
+    match v {
+        Value::Null => anyhow::bail!("TOML does not support null values"),
+        Value::Bool(b) => Ok(toml::Value::Boolean(*b)),
+        Value::Number(n) => {
+            if let Some(i) = n.as_i64() {
+                Ok(toml::Value::Integer(i))
+            } else if let Some(f) = n.as_f64() {
+                Ok(toml::Value::Float(f))
+            } else {
+                anyhow::bail!("unsupported number: {}", n)
+            }
+        }
+        Value::String(s) => Ok(toml::Value::String(s.clone())),
+        Value::Array(arr) => {
+            // Check for uniform scalar type (TOML requires homogeneous arrays at the value level,
+            // though arrays of tables are handled separately via TOML's [[table]] syntax).
+            // For simplicity we convert each element; if types are mixed, toml crate will
+            // handle it gracefully or we fall back to a JSON string.
+            let items: anyhow::Result<Vec<toml::Value>> =
+                arr.iter().map(json_to_toml_value).collect();
+            match items {
+                Ok(vals) => Ok(toml::Value::Array(vals)),
+                Err(_) => {
+                    // Fallback: serialise as JSON string
+                    Ok(toml::Value::String(serde_json::to_string(v)?))
+                }
+            }
+        }
+        Value::Object(map) => {
+            let mut toml_map = toml::map::Map::new();
+            for (k, val) in map {
+                if val.is_null() {
+                    // Skip null entries
+                    continue;
+                }
+                match json_to_toml_value(val) {
+                    Ok(tv) => {
+                        toml_map.insert(k.clone(), tv);
+                    }
+                    Err(_) => {
+                        // Fallback: serialise as JSON string
+                        toml_map
+                            .insert(k.clone(), toml::Value::String(serde_json::to_string(val)?));
+                    }
+                }
+            }
+            Ok(toml::Value::Table(toml_map))
+        }
+    }
+}
+
+/// Convert a toml Value back to a serde_json Value.
+pub fn toml_to_json_value(v: &toml::Value) -> Value {
+    match v {
+        toml::Value::Boolean(b) => Value::Bool(*b),
+        toml::Value::Integer(i) => Value::Number((*i).into()),
+        toml::Value::Float(f) => serde_json::Number::from_f64(*f)
+            .map(Value::Number)
+            .unwrap_or(Value::Null),
+        toml::Value::String(s) => Value::String(s.clone()),
+        toml::Value::Datetime(dt) => Value::String(dt.to_string()),
+        toml::Value::Array(arr) => Value::Array(arr.iter().map(toml_to_json_value).collect()),
+        toml::Value::Table(map) => {
+            let obj: serde_json::Map<String, Value> = map
+                .iter()
+                .map(|(k, v)| (k.clone(), toml_to_json_value(v)))
+                .collect();
+            Value::Object(obj)
+        }
+    }
+}