omni_dev/drive/

types.rs

//! Wire types for the Drive v3 REST API.
//!
//! Field naming follows Drive's camelCase JSON via per-field
//! `#[serde(rename = "...")]`, mirroring `src/gmail/types.rs`. `size` is
//! Drive's own wire format: a **decimal string**, not a JSON number —
//! present only for binary files with actual byte content; absent for
//! folders and Google-native documents (Docs/Sheets/Slides/...), which have
//! no fixed byte size. The content-hash fields (`md5Checksum`/
//! `sha1Checksum`/`sha256Checksum`) share that same binary-content-only
//! availability but, unlike `size`, are plain lowercase hex strings with no
//! wire-format quirk of their own.

use std::collections::HashMap;
use std::io::Write;

use anyhow::Result;
use serde::{Deserialize, Serialize};

use crate::cli::drive::format::{write_scalar_jsonl, JsonlSerialize};

/// MIME type marking a Drive folder.
///
/// A shared constant (issue #1574) — previously duplicated privately in
/// `file_move.rs` (whose own doc comment explained the duplication was to
/// avoid an engine→CLI dependency on `crate::cli::drive::read::GOOGLE_FOLDER`,
/// not to avoid sharing between engine modules) and in the new
/// `permissions/check.rs`/`permissions/lookup_folder.rs`. `read.rs`'s own
/// `GOOGLE_FOLDER` constant is untouched — this is a distinct, engine-layer
/// copy, not a rename of that one.
pub(crate) const GOOGLE_FOLDER_MIME_TYPE: &str = "application/vnd.google-apps.folder";

/// MIME type marking a Google Sheet.
///
/// Engine-layer copy, for the same reason [`GOOGLE_FOLDER_MIME_TYPE`] is one:
/// `crate::cli::drive::read`'s `GOOGLE_SHEET` is a CLI-layer constant, and an
/// engine module depending on it would invert the layering. Not a rename of
/// that one — both stay.
pub(crate) const GOOGLE_SHEET_MIME_TYPE: &str = "application/vnd.google-apps.spreadsheet";

/// MIME type marking a Google Doc.
///
/// Engine-layer copy, for the same reason [`GOOGLE_FOLDER_MIME_TYPE`] and
/// [`GOOGLE_SHEET_MIME_TYPE`] are: `crate::cli::drive::read`'s `GOOGLE_DOC`
/// is a CLI-layer constant, and an engine module depending on it would
/// invert the layering. Not a rename of that one — both stay.
pub(crate) const GOOGLE_DOC_MIME_TYPE: &str = "application/vnd.google-apps.document";

/// MIME type marking a Google Slides presentation.
///
/// Present only so the Docs commands can say "Slides isn't supported yet"
/// instead of the generic "not a Google Doc" — there is no Slides surface in
/// the tree, and adding one is a separate issue.
pub(crate) const GOOGLE_SLIDES_MIME_TYPE: &str = "application/vnd.google-apps.presentation";

/// MIME type marking a Drive shortcut.
///
/// Shortcuts are never followed: a shortcut to a spreadsheet is refused with
/// its own message rather than being silently resolved, matching
/// `drive read --content`'s existing behaviour.
pub(crate) const GOOGLE_SHORTCUT_MIME_TYPE: &str = "application/vnd.google-apps.shortcut";

/// The refusals every Sheets-mutating engine (`drive sheets
/// write`/`append`/`clear`, and `drive sheets add-sheet`/`rename-sheet`/
/// `insert-rows`/`insert-columns`) can reach for a target: two classified
/// **before** the write-permission gate ever runs (a shortcut, a
/// non-spreadsheet), and one — [`Self::NoVisibleParents`] — that the gate
/// itself reports, since a `file_id` rule must be consulted before "no
/// visible parent" can be the real story (issue #1612).
///
/// Shared via [`classify_sheet_target`] so the two pre-gate checks and
/// their order are written once rather than copied by hand into each
/// engine, where they would otherwise be free to quietly drift apart.
#[derive(Debug, Clone, PartialEq, Eq)]
pub(crate) enum SheetTargetRefusal {
    /// The target is a shortcut, which no Sheets engine follows.
    Shortcut,
    /// The target is not a Google Sheet at all.
    NotASpreadsheet {
        /// The target's actual MIME type.
        mime_type: String,
    },
    /// The target has no parents this account can see **and** no `file_id`
    /// rule named it, so no rule the operator could write would ever grant
    /// it. Not produced by [`classify_sheet_target`] — an empty
    /// `parents` list alone is not conclusive, since a `file_id` rule
    /// sitting at depth −1 could still grant the target; only the gate
    /// step (which checks that rule first) can tell the two apart.
    NoVisibleParents,
}

/// Classifies `target` against the two pre-gate checks above. `Ok(())`
/// means neither applies and the caller should proceed to the
/// write-permission gate next — which may still report
/// [`SheetTargetRefusal::NoVisibleParents`] itself.
pub(crate) fn classify_sheet_target(target: &DriveFile) -> Result<(), SheetTargetRefusal> {
    if target.mime_type == GOOGLE_SHORTCUT_MIME_TYPE {
        return Err(SheetTargetRefusal::Shortcut);
    }
    if target.mime_type != GOOGLE_SHEET_MIME_TYPE {
        return Err(SheetTargetRefusal::NotASpreadsheet {
            mime_type: target.mime_type.clone(),
        });
    }
    Ok(())
}

/// An owner of a Drive file, as embedded in `files.list`/`files.get`'s
/// `owners[]` field (requested via the `fields` param's
/// `owners(displayName,emailAddress)` sub-selector — see `files_api.rs`).
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq, Default)]
pub struct Owner {
    /// The owner's display name.
    #[serde(
        default,
        skip_serializing_if = "Option::is_none",
        rename = "displayName"
    )]
    pub display_name: Option<String>,
    /// The owner's email address.
    #[serde(
        default,
        skip_serializing_if = "Option::is_none",
        rename = "emailAddress"
    )]
    pub email_address: Option<String>,
}

/// A Drive file (or folder, or Google-native document) — the `files`
/// resource returned by `files.list`/`files.get`.
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq, Default)]
pub struct DriveFile {
    /// Drive file id.
    pub id: String,
    /// Display name.
    pub name: String,
    /// MIME type. `application/vnd.google-apps.*` marks a Google-native
    /// document (Docs/Sheets/Slides/...) with no fixed byte content.
    #[serde(default, rename = "mimeType")]
    pub mime_type: String,
    /// Size in bytes, as a decimal string. Absent for folders and
    /// Google-native documents.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub size: Option<String>,
    /// MD5 checksum of the file's content, as a lowercase hex string.
    /// Absent for folders and Google-native documents. Has the broadest
    /// historical coverage of the three checksum fields — sha1/sha256 were
    /// added to the Drive API later, so a very old, untouched file may lack
    /// them while still carrying this one.
    #[serde(
        default,
        skip_serializing_if = "Option::is_none",
        rename = "md5Checksum"
    )]
    pub md5_checksum: Option<String>,
    /// SHA-1 checksum of the file's content, as a lowercase hex string.
    /// Same availability caveats as [`Self::md5_checksum`].
    #[serde(
        default,
        skip_serializing_if = "Option::is_none",
        rename = "sha1Checksum"
    )]
    pub sha1_checksum: Option<String>,
    /// SHA-256 checksum of the file's content, as a lowercase hex string.
    /// Same availability caveats as [`Self::md5_checksum`].
    #[serde(
        default,
        skip_serializing_if = "Option::is_none",
        rename = "sha256Checksum"
    )]
    pub sha256_checksum: Option<String>,
    /// Last modification time (RFC 3339).
    #[serde(
        default,
        skip_serializing_if = "Option::is_none",
        rename = "modifiedTime"
    )]
    pub modified_time: Option<String>,
    /// A monotonically increasing version number for the file, incremented
    /// on every change including ones that do not modify content (e.g. a
    /// permission change) — Drive's own opaque revision counter, requested
    /// so the Drive write lease ([ADR-0080](../../docs/adrs/adr-0080.md)
    /// §6) can detect that a file moved since a lease was acquired or last
    /// written under. An arbitrary-precision decimal string per Drive's own
    /// documentation, so it is compared for equality only, never parsed as
    /// a number.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub version: Option<String>,
    /// Ids of the parent folders containing this file.
    #[serde(default, skip_serializing_if = "Vec::is_empty")]
    pub parents: Vec<String>,
    /// A link for opening this file in a relevant Google editor or viewer.
    #[serde(
        default,
        skip_serializing_if = "Option::is_none",
        rename = "webViewLink"
    )]
    pub web_view_link: Option<String>,
    /// The file's owners.
    #[serde(default, skip_serializing_if = "Vec::is_empty")]
    pub owners: Vec<Owner>,
    /// Id of the shared drive this file lives on, if any.
    #[serde(default, skip_serializing_if = "Option::is_none", rename = "driveId")]
    pub drive_id: Option<String>,
    /// Export links for a Google-native document, keyed by export MIME
    /// type. Present only on `files.get` (requested in `GET_FIELDS`;
    /// deliberately **not** requested by `files.list`'s `LIST_FIELDS` — it's
    /// irrelevant to a search-result table and would bloat every list
    /// response). Values are export URLs (unused — Drive's `files.export`
    /// endpoint is called directly instead); `drive read`'s content-export
    /// error path lists these keys when a Google-native file has no default
    /// export MIME type.
    #[serde(
        default,
        skip_serializing_if = "Option::is_none",
        rename = "exportLinks"
    )]
    pub export_links: Option<HashMap<String, String>>,
}

impl DriveFile {
    /// Whether this is a Google-native document (Docs/Sheets/Slides/Forms/
    /// Drawings/...) with no fixed byte content — must be fetched via
    /// `files.export`, never `files.get?alt=media`.
    #[must_use]
    pub fn is_google_native(&self) -> bool {
        self.mime_type.starts_with("application/vnd.google-apps.")
    }
}

/// Response envelope for `GET /drive/v3/files`.
#[derive(Debug, Clone, Default, Serialize, Deserialize, PartialEq, Eq)]
pub struct FileListResponse {
    /// Matching files on this page.
    #[serde(default)]
    pub files: Vec<DriveFile>,
    /// Cursor for the next page, when more results are available.
    /// [`crate::drive::files_api::FilesApi::search_all`] clears this rather
    /// than leaving it pointing past files it discarded when a
    /// caller-supplied limit truncates the result — `None` here means
    /// either no more results exist upstream, or the search was capped,
    /// never a false invitation to keep paging.
    #[serde(
        default,
        skip_serializing_if = "Option::is_none",
        rename = "nextPageToken"
    )]
    pub next_page_token: Option<String>,
    /// Whether the search process was incomplete (partial results returned
    /// due to a transient issue on Google's side). Also cleared by
    /// [`crate::drive::files_api::FilesApi::search_all`] when truncation
    /// discards fetched files, for the same reason as
    /// [`Self::next_page_token`].
    #[serde(
        default,
        skip_serializing_if = "Option::is_none",
        rename = "incompleteSearch"
    )]
    pub incomplete_search: Option<bool>,
}

impl JsonlSerialize for DriveFile {
    fn write_jsonl(&self, out: &mut dyn Write) -> Result<()> {
        write_scalar_jsonl(self, out)
    }
}

/// A Drive permission, as returned by `permissions.list(fileId)`.
///
/// The building block `crate::drive::visibility` diffs to detect a move's
/// effect on a file's visibility. Fetched by
/// `crate::drive::permissions_api::PermissionsApi::list_all`.
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq, Default)]
pub struct DrivePermission {
    /// Permission id.
    #[serde(default)]
    pub id: String,
    /// `"user"` / `"group"` / `"domain"` / `"anyone"`.
    #[serde(default, rename = "type")]
    pub permission_type: String,
    /// The granted role (`"reader"`/`"writer"`/`"owner"`/...). Not used by
    /// the visibility-diff algorithm — `crate::drive::visibility::Principal`
    /// deliberately excludes role from its identity — kept only for
    /// informational logging.
    #[serde(default)]
    pub role: String,
    /// The user's or group's email address (`type: "user"`/`"group"` only).
    #[serde(
        default,
        skip_serializing_if = "Option::is_none",
        rename = "emailAddress"
    )]
    pub email_address: Option<String>,
    /// The Workspace domain (`type: "domain"` only).
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub domain: Option<String>,
}

#[cfg(test)]
#[allow(clippy::unwrap_used, clippy::expect_used)]
mod tests {
    use super::*;

    #[test]
    fn file_list_response_deserializes_a_realistic_fixture() {
        let json = serde_json::json!({
            "files": [
                {
                    "id": "f1",
                    "name": "report.pdf",
                    "mimeType": "application/pdf",
                    "size": "12345",
                    "md5Checksum": "5d41402abc4b2a76b9719d911017c592",
                    "sha1Checksum": "aaf4c61ddcc5e8a2dabede0f3b482cd9aea9434d",
                    "sha256Checksum": "9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08",
                    "modifiedTime": "2026-01-01T00:00:00.000Z",
                    "parents": ["folder1"],
                    "webViewLink": "https://drive.google.com/file/d/f1/view",
                    "owners": [{"displayName": "Alice", "emailAddress": "alice@example.com"}],
                    "driveId": "shared1",
                },
            ],
            "nextPageToken": "page2",
            "incompleteSearch": false,
        });
        let response: FileListResponse = serde_json::from_value(json).unwrap();
        assert_eq!(response.files.len(), 1);
        let file = &response.files[0];
        assert_eq!(file.id, "f1");
        assert_eq!(file.size.as_deref(), Some("12345"));
        assert_eq!(
            file.md5_checksum.as_deref(),
            Some("5d41402abc4b2a76b9719d911017c592")
        );
        assert_eq!(
            file.sha1_checksum.as_deref(),
            Some("aaf4c61ddcc5e8a2dabede0f3b482cd9aea9434d")
        );
        assert_eq!(
            file.sha256_checksum.as_deref(),
            Some("9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08")
        );
        assert_eq!(
            file.owners[0].email_address.as_deref(),
            Some("alice@example.com")
        );
        assert_eq!(file.drive_id.as_deref(), Some("shared1"));
        assert_eq!(response.next_page_token.as_deref(), Some("page2"));
    }

    #[test]
    fn checksums_are_none_when_absent() {
        let json = serde_json::json!({"id": "f1", "name": "n"});
        let file: DriveFile = serde_json::from_value(json).unwrap();
        assert!(file.md5_checksum.is_none());
        assert!(file.sha1_checksum.is_none());
        assert!(file.sha256_checksum.is_none());
    }

    #[test]
    fn size_round_trips_as_a_string_not_a_number() {
        let file = DriveFile {
            id: "f1".to_string(),
            name: "n".to_string(),
            size: Some("999".to_string()),
            ..Default::default()
        };
        let value = serde_json::to_value(&file).unwrap();
        assert_eq!(value["size"], serde_json::json!("999"));
    }

    #[test]
    fn is_google_native_true_for_google_apps_mime_type() {
        let file = DriveFile {
            mime_type: "application/vnd.google-apps.document".to_string(),
            ..Default::default()
        };
        assert!(file.is_google_native());
    }

    #[test]
    fn is_google_native_false_for_ordinary_mime_type() {
        let file = DriveFile {
            mime_type: "application/pdf".to_string(),
            ..Default::default()
        };
        assert!(!file.is_google_native());
    }

    #[test]
    fn drive_file_deserializes_from_minimal_fields() {
        let json = serde_json::json!({"id": "f1", "name": "n"});
        let file: DriveFile = serde_json::from_value(json).unwrap();
        assert_eq!(file.id, "f1");
        assert_eq!(file.mime_type, "");
        assert!(file.size.is_none());
        assert!(file.export_links.is_none());
    }

    #[test]
    fn deserializing_unmodeled_extra_field_still_succeeds() {
        let json = serde_json::json!({
            "id": "f1",
            "name": "n",
            "somethingNew": {"nested": true},
        });
        let file: DriveFile = serde_json::from_value(json).unwrap();
        assert_eq!(file.id, "f1");
    }

    #[test]
    fn export_links_parses_google_native_export_map() {
        let json = serde_json::json!({
            "id": "f1",
            "name": "doc",
            "mimeType": "application/vnd.google-apps.document",
            "exportLinks": {
                "text/markdown": "https://export.example/md",
                "application/pdf": "https://export.example/pdf",
            },
        });
        let file: DriveFile = serde_json::from_value(json).unwrap();
        let links = file.export_links.unwrap();
        assert_eq!(links.len(), 2);
        assert!(links.contains_key("text/markdown"));
    }

    #[test]
    fn drive_file_write_jsonl_emits_exactly_one_line() {
        let file = DriveFile {
            id: "f1".to_string(),
            name: "n".to_string(),
            ..Default::default()
        };
        let mut buf = Vec::new();
        file.write_jsonl(&mut buf).unwrap();
        let text = String::from_utf8(buf).unwrap();
        assert_eq!(text.lines().count(), 1);
        assert!(text.contains("f1"));
    }

    // ── classify_sheet_target ───────────────────────────────────────────

    fn sheet_target(parents: &[&str]) -> DriveFile {
        DriveFile {
            id: "sheet-1".to_string(),
            name: "Budget".to_string(),
            mime_type: GOOGLE_SHEET_MIME_TYPE.to_string(),
            parents: parents.iter().map(ToString::to_string).collect(),
            ..Default::default()
        }
    }

    #[test]
    fn classify_sheet_target_allows_a_spreadsheet_with_a_visible_parent() {
        assert_eq!(classify_sheet_target(&sheet_target(&["parent-1"])), Ok(()));
    }

    #[test]
    fn classify_sheet_target_refuses_a_shortcut_even_to_a_spreadsheet() {
        let mut target = sheet_target(&["parent-1"]);
        target.mime_type = GOOGLE_SHORTCUT_MIME_TYPE.to_string();
        assert_eq!(
            classify_sheet_target(&target),
            Err(SheetTargetRefusal::Shortcut)
        );
    }

    #[test]
    fn classify_sheet_target_refuses_a_non_spreadsheet() {
        let mut target = sheet_target(&["parent-1"]);
        target.mime_type = "application/pdf".to_string();
        assert_eq!(
            classify_sheet_target(&target),
            Err(SheetTargetRefusal::NotASpreadsheet {
                mime_type: "application/pdf".to_string()
            })
        );
    }

    #[test]
    fn classify_sheet_target_allows_a_spreadsheet_with_no_visible_parents() {
        // `NoVisibleParents` is now reported by the gate step, not here —
        // an empty `parents` list alone isn't conclusive, since a
        // `file_id` rule could still grant the target (issue #1612). See
        // `target_gate.rs`'s tests for that decision.
        assert_eq!(classify_sheet_target(&sheet_target(&[])), Ok(()));
    }
}