# API Documentation

## Base URL

```
http://localhost:3000/api
```

## Endpoints

### 1. Search / Generate Hashes

**Endpoint**: `POST /api/search`

**Description**: Search for a hash in the database or generate hashes from plaintext.

#### Request

**Headers**:
```
Content-Type: application/json
```

**Body**:
```json
{
  "query": "string"  // Required: Hash or plaintext to search/generate
}
```

#### Response Examples

##### Case 1: Hash Found in Database

**Request**:
```json
{
  "query": "5f4dcc3b5aa765d61d8327deb882cf99"
}
```

**Response** (200 OK):
```json
{
  "found": true,
  "hashType": "md5",
  "hash": "5f4dcc3b5aa765d61d8327deb882cf99",
  "results": [
    {
      "plaintext": "password",
      "hashes": {
        "md5": "5f4dcc3b5aa765d61d8327deb882cf99",
        "sha1": "5baa61e4c9b93f3f0682250b6cf8331b7ee68fd8",
        "sha256": "5e884898da28047151d0e56f8dc6292773603d0d6aabbdd62a11ef721d1542d8",
        "sha512": "b109f3bbbc244eb82441917ed06d618b9008dd09b3befd1b5e07394c706a8bb980b1d7785e5976ec049b46df5f1326af5a2ea6d103fd07c95385ffab0cacbc86"
      }
    }
  ]
}
```

##### Case 2: Hash Not Found in Database

**Request**:
```json
{
  "query": "abc123def456789abc123def456789ab"
}
```

**Response** (200 OK):
```json
{
  "found": false,
  "hashType": "md5",
  "hash": "abc123def456789abc123def456789ab",
  "message": "Hash not found in database"
}
```

##### Case 3: Plaintext Input (Hash Generation)

**Request**:
```json
{
  "query": "mypassword"
}
```

**Response** (200 OK):
```json
{
  "found": true,
  "isPlaintext": true,
  "plaintext": "mypassword",
  "hashes": {
    "md5": "34819d7beeabb9260a5c854bc85b3e44",
    "sha1": "91dfd9ddb4198affc5c194cd8ce6d338fde470e2",
    "sha256": "89e01536ac207279409d4de1e5253e01f4a1769e696db0d6062ca9b8f56767c8",
    "sha512": "a336f671080fbf4f2a230f313560ddf0d0c12dfcf1741e49e8722a234673037dc493e1c04ce89532b85b8d5c8e7baf1e532c67a89b5c4c8c1e98ba1e14c64e4e"
  }
}
```

Note: When plaintext is provided, it is automatically indexed in Elasticsearch for future lookups.

#### Error Responses

**400 Bad Request** - Missing or invalid query parameter:
```json
{
  "error": "Query parameter is required"
}
```

**500 Internal Server Error** - Server or Elasticsearch error:
```json
{
  "error": "Internal server error",
  "details": "Connection refused"
}
```

---

### 2. Health Check

**Endpoint**: `GET /api/health`

**Description**: Check the health of the application and Elasticsearch connection.

#### Request

No parameters required.

#### Response

**Success** (200 OK):
```json
{
  "status": "ok",
  "elasticsearch": {
    "cluster": "elasticsearch",
    "status": "green"
  },
  "index": {
    "exists": true,
    "name": "hasher",
    "stats": {
      "documentCount": 1542,
      "indexSize": 524288
    }
  }
}
```

**Elasticsearch cluster status values**:
- `green`: All primary and replica shards are active
- `yellow`: All primary shards are active, but not all replicas
- `red`: Some primary shards are not active

**Error** (503 Service Unavailable):
```json
{
  "status": "error",
  "error": "Connection refused to Elasticsearch"
}
```

---

## Hash Type Detection

The API automatically detects hash types based on length and format:

| Hash Type | Length (hex chars) | Pattern |
|-----------|-------------------|---------|
| MD5       | 32                | `^[a-f0-9]{32}$` |
| SHA1      | 40                | `^[a-f0-9]{40}$` |
| SHA256    | 64                | `^[a-f0-9]{64}$` |
| SHA512    | 128               | `^[a-f0-9]{128}$` |
| Bcrypt    | 60                | `^\$2[abxy]\$` |

Hashes are case-insensitive.

---

## Usage Examples

### cURL

**Search for a hash**:
```bash
curl -X POST http://localhost:3000/api/search \
  -H "Content-Type: application/json" \
  -d '{"query":"5f4dcc3b5aa765d61d8327deb882cf99"}'
```

**Generate hashes**:
```bash
curl -X POST http://localhost:3000/api/search \
  -H "Content-Type: application/json" \
  -d '{"query":"password"}'
```

**Health check**:
```bash
curl http://localhost:3000/api/health
```

### JavaScript (fetch)

```javascript
// Search for a hash
const response = await fetch('http://localhost:3000/api/search', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({ query: '5f4dcc3b5aa765d61d8327deb882cf99' })
});
const data = await response.json();
console.log(data);
```

### Python (requests)

```python
import requests

# Search for a hash
response = requests.post(
    'http://localhost:3000/api/search',
    json={'query': '5f4dcc3b5aa765d61d8327deb882cf99'}
)
print(response.json())

# Health check
health = requests.get('http://localhost:3000/api/health')
print(health.json())
```

---

## Rate Limiting

Currently, there is no rate limiting implemented. For production use, consider implementing rate limiting at the API gateway or application level.

## CORS

The API accepts requests from any origin by default. For production deployment, configure CORS appropriately in your Next.js configuration.

---

## Notes

- All timestamps are in ISO 8601 format
- The API automatically creates the Elasticsearch index if it doesn't exist
- Plaintext searches are automatically indexed for future lookups
- Searches are case-insensitive
- Hashes must be valid hexadecimal strings