ansible/lookup/vault: use ansible variable

Signed-off-by: Alexis Pentori <alexis@status.im>

ansible/lookup_plugins/vault.py

@@ -5,15 +5,11 @@ import sys
 import os
 import hvac
 
-
 from ansible.errors import AnsibleError
 from ansible.plugins.lookup import LookupBase
+from ansible.utils.display import Display
 
-try:
-    from __main__ import display
-except ImportError:
-    from ansible.utils.display import Display
-    display = Display()
+display = Display()
 
 
 DOCUMENTATION = """
@@ -26,20 +22,45 @@ requirements:
     - VAULT_TOKEN environment var
 short_description: look up data from a Hashicorp vault
 decription:
-    - Use the hvac library  to grab one or more items stored in a Hashicorp Vault
+    - Use the hvac library to grab one or more items stored in a Hashicorp Vault
+    - The plugin use the variable <env> and <stage> form ansible to determined the path to query
 options:
     path:
-        description: path of the secret in the Vault
+        description: Path of the secret in the Vault, by default the Path will be prefixed by the <env>/<stage>/<path>
         required: true
     field:
-        description: field to return from vault
+        description: Field to return from vault
         required: true
+    stage:
+        description: Override the value of stage used in the path 
+        required: false
+    env:
+        description: Override the value of the env used in the path
+        required: false
+    override:
+        description: Search only for the path specifed
+        required: false
 """
 
 Examples = """
-- name: get 'username' from Vault entry 'test'
+- name: Get 'username' from Vault entry 'config' to fetch secret from 'example/test/config'
   debug:
-    msg: "{{ lookup('vault, 'test', field='username' ) }}"
+    msg: "{{ lookup('vault, 'config', field='username' )}}"
+  vars:
+    env: 'example'
+    stage: 'test'
+- name: Get 'username' from Vault entry 'config' to fetch secret from 'example-2/prod/config' 
+  debug:
+    msg: "{{ lookup('vault, 'test', field='username', stage='prod', env='example-2' )}}"
+  vars:
+    env: 'example'
+    stage: 'test'
+- name: Get 'username' from Vault entry 'config' to fetch secret from 'other/path/to/config'
+  debug:
+    msg: "{{ lookup('vault, 'other/path/to/config', field='username', override=True)}}"
+  vars:
+    env: 'example'
+    stage: 'test'
 """
 
 RETURN = """
@@ -47,39 +68,35 @@ RETURN = """
     description:
       - Items for Hashicorp Vault
 """
+VAULT_CACERT      = os.environ.get('VAULT_CACERT',      './ansible/files/vault-ca.crt')
+VAULT_CLIENT_CERT = os.environ.get('VAULT_CLIENT_CERT', './ansible/files/vault-client-user.crt')
+VAULT_CLIENT_KEY  = os.environ.get('VAULT_CLIENT_KEY',  './ansible/files/vault-client-user.key')
 
 class LookupModule(LookupBase):
 
-    def run(self, terms, **kwargs):
-        VAULT_CACERT      = os.environ.get('VAULT_CACERT',      './ansible/files/vault-ca.crt')
-        VAULT_CLIENT_CERT = os.environ.get('VAULT_CLIENT_CERT', './ansible/files/vault-client-user.crt')
-        VAULT_CLIENT_KEY  = os.environ.get('VAULT_CLIENT_KEY',  './ansible/files/vault-client-user.key')
-
+    def run(self, terms, field: str, variables=None, override: str = False, **kwargs):
         self.vault = hvac.Client(cert=(VAULT_CLIENT_CERT, VAULT_CLIENT_KEY),verify=VAULT_CACERT)
         values = []
-
+        env = kwargs.get("env", variables["env"])
+        stage = kwargs.get("stage", variables["stage"])
+        prefix = ""
+        if override:
+            display.debug("Overriding the env/stage behavior and using only the path provided: %s" % terms)
+        else: 
+            display.debug("Using the env : %s and the stage : %s" % (env, stage))
+            prefix=f"{env}/{stage}/"
         for term in terms:
-            rval = self.lookup(term, kwargs)
+            rval = self.lookup(f"{prefix}{term}", field=field)
             if rval is None:
-                raise AnsibleError("No matching term, field found!")
+                raise AnsibleError("No matching term, field not found!")
             values.append(rval)
 
         return values
 
-    def lookup(self, term, kwargs):
+    def lookup(self, term, **kwargs):
         field  = kwargs.get('field')
+        display.v("Querying Vault field %s at path %s" % (field,term))
         val = self.vault.secrets.kv.read_secret_version(term)
         if val:
             return str(val['data']['data'][field])
 
-
-def main():
-    if len(sys.argv) < 3:
-        print("Usage: %s <path> <field>" % os.path.basename(__file__))
-        return -1
-    print(LookupModule().run(sys.argv[1], field=sys.argv[2]))
-
-    return 0
-
-if __name__ == "__main__":
-    sys.exit(main())