PYTHON-5909 / PYTHON-5979 Add GA support for Queryable Encryption string queries + Add QE prefix+suffix GA and rename API to string

.evergreen/generated_configs/tasks.yml

@@ -4591,6 +4591,29 @@ tasks:
       - async
       - free-threaded
 
+  # String query preview tests
+  - name: test-string-query-preview-v8.2-python3.14-noauth-ssl-replica-set
+    commands:
+      - func: run server
+        vars:
+          AUTH: noauth
+          SSL: ssl
+          TOPOLOGY: replica_set
+          VERSION: "8.2"
+      - func: run tests
+        vars:
+          AUTH: noauth
+          SSL: ssl
+          TOPOLOGY: replica_set
+          VERSION: "8.2"
+          TOOLCHAIN_VERSION: "3.14"
+    tags:
+      - test-string-query-preview
+      - server-8.2
+      - python-3.14
+      - replica_set-noauth-ssl
+      - noauth
+
   # Test non standard tests
   - name: test-non-standard-v4.2-python3.11-noauth-ssl-replica-set
     commands:

.evergreen/generated_configs/variants.yml

@@ -184,6 +184,7 @@ buildvariants:
   - name: encryption-rhel8
     tasks:
       - name: .test-non-standard
+      - name: .test-string-query-preview
     display_name: Encryption RHEL8
     run_on:
       - rhel87-small
@@ -195,6 +196,7 @@ buildvariants:
     tasks:
       - name: .test-non-standard !.pypy !.cov
       - name: .test-non-standard-no-cov !.pypy
+      - name: .test-string-query-preview
     display_name: Encryption macOS
     run_on:
       - macos-14
@@ -206,6 +208,7 @@ buildvariants:
     tasks:
       - name: .test-non-standard !.pypy !.cov
       - name: .test-non-standard-no-cov !.pypy
+      - name: .test-string-query-preview
     display_name: Encryption Win64
     run_on:
       - windows-2022-latest-small
@@ -216,6 +219,7 @@ buildvariants:
   - name: encryption-crypt_shared-rhel8
     tasks:
       - name: .test-non-standard
+      - name: .test-string-query-preview
     display_name: Encryption crypt_shared RHEL8
     run_on:
       - rhel87-small
@@ -228,6 +232,7 @@ buildvariants:
     tasks:
       - name: .test-non-standard !.pypy !.cov
       - name: .test-non-standard-no-cov !.pypy
+      - name: .test-string-query-preview
     display_name: Encryption crypt_shared macOS
     run_on:
       - macos-14
@@ -240,6 +245,7 @@ buildvariants:
     tasks:
       - name: .test-non-standard !.pypy !.cov
       - name: .test-non-standard-no-cov !.pypy
+      - name: .test-string-query-preview
     display_name: Encryption crypt_shared Win64
     run_on:
       - windows-2022-latest-small

.evergreen/scripts/generate_config.py

@@ -130,13 +130,17 @@ def get_encryption_expansions(encryption):
     ):
         expansions = get_encryption_expansions(encryption)
         display_name = get_variant_name(encryption, host, **expansions)
-        tasks = [".test-non-standard"]
+        tasks = [".test-non-standard", ".test-string-query-preview"]
         if host != "rhel8":
             # Exclude PyPy (not tested with encryption on macOS/win64) and coverage tasks
             # (encryption suites exceed the 60-min timeout with coverage overhead on macOS/win64).
             # Also include the non-coverage companion tasks (test-non-standard-no-cov) which
             # carry the "latest" server tasks without COVERAGE=1.
-            tasks = [".test-non-standard !.pypy !.cov", ".test-non-standard-no-cov !.pypy"]
+            tasks = [
+                ".test-non-standard !.pypy !.cov",
+                ".test-non-standard-no-cov !.pypy",
+                ".test-string-query-preview",
+            ]
         variant = create_variant(
             tasks,
             display_name,
@@ -719,6 +723,34 @@ def create_test_non_standard_tasks():
     return tasks
 
 
+def create_string_query_preview_tasks():
+    """Tasks for the preview Queryable Encryption string query types.
+
+    The preview query types need a server that is at least 8.2 and older than
+    9.0, and ALL_VERSIONS jumps straight from 8.0 to 9.0, so they have nowhere
+    to run without a dedicated task. setup_tests.py pins the released
+    pymongocrypt for 8.x, which bundles a libmongocrypt still carrying the
+    preview types.
+    """
+    python = CPYTHONS[-1]
+    topology = "replica_set"
+    auth, ssl = get_standard_auth_ssl(topology)
+    expansions = dict(AUTH=auth, SSL=ssl, TOPOLOGY=topology, VERSION="8.2")
+    tags = [
+        "test-string-query-preview",
+        "server-8.2",
+        f"python-{python}",
+        f"{topology}-{auth}-{ssl}",
+        auth,
+    ]
+    name = get_task_name("test-string-query-preview", python=python, **expansions)
+    server_func = FunctionCall(func="run server", vars=expansions)
+    test_vars = expansions.copy()
+    test_vars["TOOLCHAIN_VERSION"] = python
+    test_func = FunctionCall(func="run tests", vars=test_vars)
+    return [EvgTask(name=name, tags=tags, commands=[server_func, test_func])]
+
+
 def create_test_standard_auth_tasks():
     """We only use auth on sharded clusters"""
     tasks = []

.evergreen/scripts/setup_tests.py

@@ -52,6 +52,10 @@
 # The python version used for perf tests.
 PERF_PYTHON_VERSION = "3.10.11"
 
+# The libmongocrypt release used when LIBMONGOCRYPT_URL is not set. Must be at
+# least 1.20.0 for the GA "substring" query type.
+LIBMONGOCRYPT_VERSION = "1.20.2"
+
 
 def is_set(var: str) -> bool:
     value = os.environ.get(var, "")
@@ -72,43 +76,56 @@ def get_distro() -> Distro:
     return Distro(name=name, version_id=version_id, arch=arch)
 
 
-def setup_libmongocrypt():
-    target = ""
+def get_libmongocrypt_target() -> str:
+    """Return the libmongocrypt release asset target for this platform.
+
+    These are the names used by the signed release assets on GitHub, which are
+    keyed by libc flavor rather than by distro (MONGOCRYPT-838 moved the
+    per-variant release builds to a restricted bucket).
+    """
     if PLATFORM == "windows":
-        # PYTHON-2808 Ensure this machine has the CA cert for google KMS.
-        if is_set("TEST_FLE_GCP_AUTO"):
-            run_command('powershell.exe "Invoke-WebRequest -URI https://oauth2.googleapis.com/"')
-        target = "windows-test"
+        return "windows-x86_64"
+    if PLATFORM == "darwin":
+        return "macos-universal"
+
+    distro = get_distro()
+    arch = distro.arch
+    if arch in ("aarch64", "arm64"):
+        arch = "arm64"
+    elif arch in ("x86_64", "amd64"):
+        arch = "x86_64"
+
+    # Alpine and other musl distros need the musl build.
+    if "Alpine" in distro.name:
+        if arch not in ("x86_64", "arm64"):
+            raise ValueError(f"No musl libmongocrypt build for architecture {distro.arch}!")
+        return f"linux-{arch}-musl_1_2-nocrypto"
+
+    libc = {
+        "x86_64": "glibc_2_7",
+        "arm64": "glibc_2_17",
+        "ppc64le": "glibc_2_17",
+        "s390x": "glibc_2_7",
+    }.get(arch)
+    if libc is None:
+        raise ValueError(f"No libmongocrypt build for architecture {distro.arch}!")
+    return f"linux-{arch}-{libc}-nocrypto"
 
-    elif PLATFORM == "darwin":
-        target = "macos"
 
-    else:
-        distro = get_distro()
-        if distro.name.startswith("Debian"):
-            target = f"debian{distro.version_id}"
-        elif distro.name.startswith("Ubuntu"):
-            if distro.version_id == "20.04":
-                target = "debian11"
-            elif distro.version_id == "22.04":
-                target = "debian12"
-            elif distro.version_id == "24.04":
-                target = "debian13"
-        elif distro.name.startswith("Red Hat"):
-            if distro.version_id.startswith("7"):
-                target = "rhel-70-64-bit"
-            elif distro.version_id.startswith("8"):
-                if distro.arch == "aarch64":
-                    target = "rhel-82-arm64"
-                else:
-                    target = "rhel-80-64-bit"
+def setup_libmongocrypt():
+    if PLATFORM == "windows" and is_set("TEST_FLE_GCP_AUTO"):
+        # PYTHON-2808 Ensure this machine has the CA cert for google KMS.
+        run_command('powershell.exe "Invoke-WebRequest -URI https://oauth2.googleapis.com/"')
 
-    if not is_set("LIBMONGOCRYPT_URL"):
-        if not target:
-            raise ValueError("Cannot find libmongocrypt target for current platform!")
-        url = f"https://s3.amazonaws.com/mciuploads/libmongocrypt/{target}/master/latest/libmongocrypt.tar.gz"
-    else:
+    if is_set("LIBMONGOCRYPT_URL"):
         url = os.environ["LIBMONGOCRYPT_URL"]
+    else:
+        version = os.environ.get("LIBMONGOCRYPT_VERSION", LIBMONGOCRYPT_VERSION)
+        target = get_libmongocrypt_target()
+        url = (
+            f"https://github.com/mongodb/libmongocrypt/releases/download/"
+            f"{version}/libmongocrypt-{target}-{version}.tar.gz"
+        )
 
     shutil.rmtree(HERE / "libmongocrypt", ignore_errors=True)
 
@@ -122,11 +139,25 @@ def setup_libmongocrypt():
     LOGGER.info(f"Fetching {url}... done.")
 
     run_command("ls -la libmongocrypt")
-    run_command("ls -la libmongocrypt/nocrypto")
 
     if PLATFORM == "windows":
-        # libmongocrypt's windows dll is not marked executable.
-        run_command("chmod +x libmongocrypt/nocrypto/bin/mongocrypt.dll")
+        # libmongocrypt's windows dll is not marked executable. Use Path.chmod
+        # rather than shelling out: the bundled POSIX chmod cannot resolve the
+        # drive-lettered absolute path that get_libmongocrypt_base() returns.
+        dll = get_libmongocrypt_base() / "bin/mongocrypt.dll"
+        dll.chmod(dll.stat().st_mode | stat.S_IEXEC)
+
+
+def get_libmongocrypt_base() -> Path:
+    """Return the root of the extracted libmongocrypt archive.
+
+    The signed release archives put ``lib/`` at the archive root, while the
+    older master builds nested everything under ``nocrypto/``.
+    """
+    base = ROOT / "libmongocrypt"
+    if (base / "nocrypto").exists():
+        return base / "nocrypto"
+    return base
 
 
 def load_config_from_file(path: str | Path) -> dict[str, str]:
@@ -353,29 +384,44 @@ def handle_test_env() -> None:
         UV_ARGS.append("--extra zstd")
 
     if test_name in ["encryption", "kms"]:
-        # Check for libmongocrypt download.
-        if not (ROOT / "libmongocrypt").exists():
-            setup_libmongocrypt()
+        # The "String" algorithm and the GA prefix/suffix/substring query types
+        # need libmongocrypt 1.19.0+, which is only exercised against MongoDB
+        # 9.0+. Servers before 9.0 test the preview query types instead, which
+        # need the "textPreview" algorithm, so pin to the released pymongocrypt
+        # and use the libmongocrypt bundled in its wheel rather than the
+        # unreleased master build.
+        # Evergreen exposes the server version as VERSION, not MONGODB_VERSION
+        # (which is only set inside the separate run_server.py process).
+        use_pymongocrypt_text_preview = os.environ.get("VERSION", "").startswith("8.")
+
+        if not use_pymongocrypt_text_preview:
+            # Check for libmongocrypt download.
+            if not (ROOT / "libmongocrypt").exists():
+                setup_libmongocrypt()
 
         if not opts.test_min_deps:
-            UV_ARGS.append(
-                "--with pymongocrypt@git+https://github.com/mongodb/libmongocrypt@master#subdirectory=bindings/python"
-            )
-
-        # Use the nocrypto build to avoid dependency issues with older windows/python versions.
-        BASE = ROOT / "libmongocrypt/nocrypto"
-        if PLATFORM == "linux":
-            if (BASE / "lib/libmongocrypt.so").exists():
-                PYMONGOCRYPT_LIB = BASE / "lib/libmongocrypt.so"
+            if use_pymongocrypt_text_preview:
+                UV_ARGS.append("--with 'pymongocrypt<1.19'")
             else:
-                PYMONGOCRYPT_LIB = BASE / "lib64/libmongocrypt.so"
-        elif PLATFORM == "darwin":
-            PYMONGOCRYPT_LIB = BASE / "lib/libmongocrypt.dylib"
-        else:
-            PYMONGOCRYPT_LIB = BASE / "bin/mongocrypt.dll"
-        if not PYMONGOCRYPT_LIB.exists():
-            raise RuntimeError("Cannot find libmongocrypt shared object file")
-        write_env("PYMONGOCRYPT_LIB", PYMONGOCRYPT_LIB.as_posix())
+                UV_ARGS.append(
+                    "--with pymongocrypt@git+https://github.com/mongodb/libmongocrypt@master#subdirectory=bindings/python"
+                )
+
+        if not use_pymongocrypt_text_preview:
+            # Use the nocrypto build to avoid dependency issues with older windows/python versions.
+            BASE = get_libmongocrypt_base()
+            if PLATFORM == "linux":
+                if (BASE / "lib/libmongocrypt.so").exists():
+                    PYMONGOCRYPT_LIB = BASE / "lib/libmongocrypt.so"
+                else:
+                    PYMONGOCRYPT_LIB = BASE / "lib64/libmongocrypt.so"
+            elif PLATFORM == "darwin":
+                PYMONGOCRYPT_LIB = BASE / "lib/libmongocrypt.dylib"
+            else:
+                PYMONGOCRYPT_LIB = BASE / "bin/mongocrypt.dll"
+            if not PYMONGOCRYPT_LIB.exists():
+                raise RuntimeError("Cannot find libmongocrypt shared object file")
+            write_env("PYMONGOCRYPT_LIB", PYMONGOCRYPT_LIB.as_posix())
         # PATH is updated by configure-env.sh for access to mongocryptd.
 
     if test_name == "encryption":

doc/changelog.rst

@@ -39,6 +39,27 @@ PyMongo 4.18 brings a number of changes including:
 - Fixed a bug on Windows, and on macOS when using PyOpenSSL, where
   ``SSL_CERT_FILE``/``SSL_CERT_DIR`` were merged with, rather than replacing,
   the OS/certifi certificate store.
+- Added general availability support for Queryable Encryption prefix, suffix,
+  and substring queries against MongoDB 9.0+. Prefix and suffix queries require
+  libmongocrypt 1.19.0 or later; substring queries require libmongocrypt 1.20.0
+  or later:
+
+  - Added :attr:`~pymongo.encryption.Algorithm.STRING` and
+    :class:`~pymongo.encryption_options.StringOpts`, replacing
+    ``Algorithm.TEXTPREVIEW`` and ``TextOpts``, which are now deprecated.
+  - Added :attr:`~pymongo.encryption.QueryType.PREFIX`,
+    :attr:`~pymongo.encryption.QueryType.SUFFIX`, and
+    :attr:`~pymongo.encryption.QueryType.SUBSTRING`. The corresponding
+    ``PREFIXPREVIEW``, ``SUFFIXPREVIEW``, and ``SUBSTRINGPREVIEW`` query types
+    remain for experimental use with MongoDB versions before 9.0.
+  - Added the ``string_opts`` parameter to
+    :meth:`~pymongo.encryption.ClientEncryption.encrypt` and
+    :meth:`~pymongo.asynchronous.encryption.AsyncClientEncryption.encrypt`,
+    deprecating ``text_opts``. pymongocrypt renamed this parameter in 1.19 and
+    accepts only one of the two names per release, so passing ``text_opts``
+    with pymongocrypt 1.19 or later, ``string_opts`` with pymongocrypt 1.18 or
+    earlier, or both names at once, raises
+    :exc:`~pymongo.errors.ConfigurationError`.
 - Aggregation helpers now raise :exc:`~pymongo.errors.ConfigurationError` when
   passed an ``aggregate`` or ``pipeline`` keyword argument. Previously these
   keys silently replaced the target namespace and pipeline of the generated